Marcia Peiter | UFSM - Universidade Federal de Santa Maria (original) (raw)

Papers by Marcia Peiter

Research paper thumbnail of The Use of Artificial Intelligence for Estimating Soil Resistance to Penetration

Engenharia Agrícola

The aim of this study was to present and to evaluate methodologies for the estimation of soil res... more The aim of this study was to present and to evaluate methodologies for the estimation of soil resistance to penetration (RP) using artificial intelligence prediction techniques. In order to do so, a data base with values of physical-water characteristics of the soils available in the literature was used, and the performances of Artificial Neural Networks (ANN) and Support Vector Machines (SVM) were evaluated. The models generated from the ANNs were implemented through the multilayer perceptron with backpropagation algorithm of Matlab software, varying the number of neurons in the input and intermediate layers. For the procedure from SVM, the RapidMiner software was used, varying input variables, the kernel function and the coefficients of these functions. The efficiency of the techniques was analyzed by the ratio 1:1, and later, compared to the Busscher non-linear model (Busscher, 1990). The results showed that the artificial intelligence models (ANN and SVM) are efficient and have predictive capacity superior to the Busscher model, under data conditions of soils with textural classes and different, and similar managements, although with higher performance index values for conditions of soils of the same textural class exposed to the same management.

Research paper thumbnail of Agronomic performance of maize hybrids under supplemental irrigation depths

Revista Brasileira de Engenharia Agrícola e Ambiental

The choice of a maize hybrid, considering the technology level and irrigation management, contrib... more The choice of a maize hybrid, considering the technology level and irrigation management, contributes to the improvement of the plant productivity and water use efficiency (WUE). Thus, the objective of this study was to evaluate the effects of irrigation depths on production components, grain yield, technical efficiency, and WUE in maize hybrids. The experiment was conducted in Santiago, RS state, Brazil, in the 2015/2016 and 2016/2017 crop seasons, using a randomized block design in factorial scheme, consisting of five irrigation depths (0, 50, 75, 100 and 125% of crop evapotranspiration - ETc) and four maize hybrids in crop season I (2015/2016), and six maize hybrids in crop season II (2016/2017). The number of ears per plant, number of grains per ear, 100-grain weight, grain yield, and WUE were evaluated. The irrigation depths affected the 100-grain weight, grain yield and WUE in both crop seasons, and the number of grains per ear in crop season I. The irrigation depths increased...

Research paper thumbnail of Performance of Analysis Methods of Slope Stability for Different Geotechnical Classes Soil on Earth Dams

Engenharia Agrícola

The aim of this study was to evaluate the performance of less accurate analysis methods of slope ... more The aim of this study was to evaluate the performance of less accurate analysis methods of slope stability, in order to reduce the number of operations used by the most accurate methods available in the literature. The study evaluated four methods for calculating slope stability. Fellenius (FELLENIUS, 1936), Bishop (BISHOP, 1955), Simplified Bishop (BISHOP & MORGENSTERN, 1960) and Simplified Janbu (JANBU, 1973) were compared with the Spencer method (SPENCER, 1967), which is considered an accurate method for calculating the factor of safety (FS). The procedure was performed in scenarios with different soil groups according to the Unified Soil Classification System (USCS) (ASTM 2011), heights and slope inclinations, and under conditions of reservoir subject to fast and slow emptying. Thus, comparative analyses were made using the correlation index "r", the accuracy index "d" (WILLMOTT et al, 1985) and the performance index "c" (CAMARGO & SENTELHAS, 1997). The methods that had optimal performance for the analyzed conditions were the Simplified Bishop, the Simplified Janbu and the Bishop methods; the Simplified Bishop method obtained a correlation coefficient of 99%. Thus, they can be used as alternative methods to replace the Spencer method in the analysis of slope stability on earth dams.

Research paper thumbnail of Altura De Plantas e Diâmetro De Colmos De Sorgo Forrageiro Irrigado Em Função De Cortes

IRRIGA

ALTURA DE PLANTAS E DIÂMETRO DE COLMOS DE SORGO FORRAGEIRO IRRIGADO EM FUNÇÃO DE CORTES JARDE... more ALTURA DE PLANTAS E DIÂMETRO DE COLMOS DE SORGO FORRAGEIRO IRRIGADO EM FUNÇÃO DE CORTES JARDEL HENRIQUE KIRCHNER1; ADROALDO DIAS ROBAINA2; MARCIA XAVIER PEITER3; ROGÉRIO RICALDE TORRES4; WELLINGTON MEZZOMO5 E RICARDO BENETTI ROSSO6 1 Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Rua Nelsi Ribas Fritsch, nº 1111, bairro Esperança, Ibirubá, RS, Brasil, CEP: 98200-000, jardel.kirchner@ibiruba.ifrs.edu.br. 2 Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, diasrobaina@gmail.com. 3 Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 4 Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Rua Eng. João Viterbo de O...

Research paper thumbnail of Supplementary irrigation in Sudan grass: Leaf area index, dry matter production and water use efficiency

Research paper thumbnail of Implantation Systems and Surface Irrigation for Maize Crop in Lowland Areas

Revista Brasileira de Milho e Sorgo

The raised seedbed implantation system and the use of surfaceirrigation can be important practice... more The raised seedbed implantation system and the use of surfaceirrigation can be important practices to enable rotation with rice and ensure theexpression of the productive potential of maize in lowland areas. The purpose ofthis work was to evaluate the use of implantation systems and surface irrigationon agronomic characteristics and grain yield of maize crop in lowland areas.Two experiments were conducted in the experimental lowland area of theFederal University of Santa Maria – UFSM, during the 2014/15 crop season.The experiments consisted in the use of implantation systems with and withoutraised seedbeds and surface irrigation. The evaluated characteristics were plantheight, shoot dry mass, leaf area index, yield components and grain yield. Plantheight, leaf area index and shoot dry mass are higher when maize is grown inraised seedbeds in lowland areas. The raised seedbed system can be consideredan efficient way to improve drainage in the cultivation area, resulting in a highergra...

Research paper thumbnail of Economic of the irrigated production of forage millet

Semina: Ciências Agrárias

Irrigation is an agricultural technique that increases crop yield and reduces periods of forage s... more Irrigation is an agricultural technique that increases crop yield and reduces periods of forage shortage. However, this technique increases production costs, and the process is economically viable only when costs are lower than the financial return. Determining the technical and financial viability of irrigation is essential to assess the feasibility of forage production systems. Therefore, the objective of this study was to determine the technical and financial viability of irrigated producing of forage millet in different growing seasons in two microregions of the state of Rio Grande do Sul, Brazil. The water requirements of the growing seasons of 2012 to 2017 in the microregions of Santiago and Santa Maria varied and affected the cost of irrigation. The irrigated production of forage millet increased the total average cost by 13.42% and increased the financial return by 43.03% and 22.49% in Santiago and Santa Maria, respectively.

Research paper thumbnail of Produção Forrageira e Eficiência De Utilização Da Água Do Capim Sudão Submetido a Diferentes Lâminas De IRRIGAÇÃO1

IRRIGA

PRODUÇÃO FORRAGEIRA E EFICIÊNCIA DE UTILIZAÇÃO DA ÁGUA DO CAPIM SUDÃO SUBMETIDO A DIFERENTES LÂMI... more PRODUÇÃO FORRAGEIRA E EFICIÊNCIA DE UTILIZAÇÃO DA ÁGUA DO CAPIM SUDÃO SUBMETIDO A DIFERENTES LÂMINAS DE IRRIGAÇÃO1 WELLINGTON MEZZOMO2; MARCIA XAVIER PEITER3; ADROALDO DIAS ROBAINA4; JARDEL HENRIQUE KIRCHNER5; ROGÉRIO RICALDE TORRES6 e BRUNA DALCIN PIMENTA7 1 Trabalho retirado da tese intitulada: “Viabilidade técnica e econômica da produção de forragem do capim sudão irrigado por aspersão convencional”, do autor Wellington Mezzomo2 2 Eng. Agrônomo, Mestre, Doutorando no Programa de Pós-Graduação em Engenharia Agrícola, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, wellingtonmezzomo@gmail.com. 3 Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 4 Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 971...

Research paper thumbnail of Economic Viability of Conventional Sprinkler Irrigation in Sudan Grass Production for Beef Cattle

Journal of Agricultural Studies

The supplementary irrigation is an alternative to ensure forage production and quality in periods... more The supplementary irrigation is an alternative to ensure forage production and quality in periods with irregular rainfall, however, is necessary to know the irrigation economic viability in order to maximize profits. The study was performed in Santa Maria, Rio Grande do Sul State in southern Brazil, during 2015/2016 and 2016/2017 agricultural years, aiming to evaluate the sudan grass economic viability under different irrigation depths, in order to define which irrigation depth (0, 25, 50, 75, 100 and 125% of the reference evapotranspiration-ETo) has the highest net revenue. Forage production functions were generated and allowed to establish the carrying capacity and production costs related to each applied irrigation depth. The forage supply was 4% of the liveweight, animals with 300 kg were considered, and average daily liveweight (LW) gains of 0.5, 1.0 and 1.5 kg LW day-1 were simulated for the conversion of dry mass production in liveweight gain per hectare. Gross revenue was de...

Research paper thumbnail of Influence of Drainage Methods on Soybean Development in Lowlands

Engenharia Agrícola

The need for crop rotation and profitability in lowland areas are the two main reasons for the in... more The need for crop rotation and profitability in lowland areas are the two main reasons for the introduction of soybean cultivation in the state of Rio Grande do Sul, Brazil. These areas have poor natural drainage, which impedes proper soybean growth. In this sense, this study aimed to assess the efficiency of using broad base ridges in comparison to the surface drainage for soybean cultivation in lowlands. The study was conducted during the 2014/2015 and 2015/2016 growing seasons in São João do Polêsine, RS, Brazil. The assessed drainage methods were the use of broad base ridges with different width dimensions (22.5, 15.0, and 7.5 m) and surface drainage. The results showed that the shoot dry matter and leaf area index have similar behavior. The broad base ridge was better than the surface drainage method for these variables. The 7.5-m broad base ridge stood out among the treatments when compared to the others, as it had the best results for the leaf area index (8.66), plant height (102.5 cm), and shoot dry matter (33.06 g).

Research paper thumbnail of Desempenho produtivo do trigo em função da densidade de semeadura e lâminas de irrigação suplementar

Cultura Agronômica: Revista de Ciências Agronômicas

Com o objetivo de avaliar o efeito de diferentes lâminas de irrigação suplementar, densidades de ... more Com o objetivo de avaliar o efeito de diferentes lâminas de irrigação suplementar, densidades de semeadura e a interação destes fatores sobre a produtividade e qualidade de grãos de trigo (Triticum aestivum L.) conduziu-se um experimento em Argissolo Amarelo distrófico típico, no município de Santa Maria - RS, nas seguintes coordenadas geográficas: 29°42'55.30" S e 53°44'22.56" O. O delineamento experimental foi o de blocos ao acaso com parcelas subdivididas, com quatro repetições, onde as parcelas foram constituídas pelas lâminas de irrigação e as subparcelas pelas diferentes densidades de semeadura. Foram estabelecidas seis lâminas de irrigação: 0, 25, 50, 75, 100 e 125% da ETo e três densidades de semeadura: 250, 350 e 450 pl m-2. A produtividade mínima de 4165 kg ha-1 foi observada no tratamento sem irrigação na densidade de 450 pl m-2 e máxima de 6894 kg ha-1 na lâmina de 100% da ETo na densidade de 350 pl m-2. A lâmina de irrigação e densidade de semeadura in...

Research paper thumbnail of Estimativa Da Radiação Solar Global Para Fins De Manejo De Irrigação

REVISTA ENGENHARIA NA AGRICULTURA - REVENG

A estimativa da radiação solar global é um dos elementos mais importantes na quantificação da dem... more A estimativa da radiação solar global é um dos elementos mais importantes na quantificação da demanda evaporativa da atmosfera e, por consequência, para o manejo de água em sistemas agrícolas. A grande maioria dos procedimentos metodológicos para estimar a radiação solar global necessita de séries de dados, muitas vezes não disponíveis. Na ausência de dados observados de Rs é possível estimá-los mediante a utilização de modelos matemáticos. Em geral, os modelos variam em grau de complexidade e nos coeficientes de ajuste, e esses devem ser calibrados para o local de interesse para obtenção do melhor desempenho. Neste sentido, o objetivo do presente estudo foi avaliar e calibrar diferentes modelos de estimativa da radiação solar global em escala diária, a partir de dados de temperatura do ar, para o município de Santa Maria - RS. Os dados foram adquiridos da estação meteorológica automática (EMA) do Instituto Nacional de Meteorologia (INMET), localizada na cidade de Santa Maria – RS. ...

Research paper thumbnail of Economically optimal water depth and grain yield of common bean subjected to different irrigation depths

Revista Brasileira de Engenharia Agrícola e Ambiental

Common bean crop plays an important role in the world, not only in economic aspects but also in s... more Common bean crop plays an important role in the world, not only in economic aspects but also in social development. The objective of this study was to evaluate the grain yield and the economically optimal water depth which reflects the maximum technical efficiency of the common bean crop. The experiment was conducted in greenhouse, in Alegrete - RS, from February to May 2016. A completely randomized design was used, consisting of five water replacement treatments (25, 50, 75, 100 and 125% crop evapotranspiration - ETc) and four replicates. Based on the obtained results, both water deficit and water excess directly affected the final grain yield of the crop. Maximum grain yield was 3,554.1 kg ha-1, obtained by applying 492.72 mm (100% ETc). On the other hand, the economically optimal water depth was estimated at 91.2% ETc, indicating that water depths above this value are not suitable for maximum technical efficiency in the common bean crop under these conditions. It was concluded th...

Research paper thumbnail of Water productivity and production function in irrigated millet crop

Semina: Ciências Agrárias

Determining the function that correlates water productivity with crop yield is essential for the ... more Determining the function that correlates water productivity with crop yield is essential for the correct sizing and management of irrigated agricultural systems. The objectives of this study are to determine forage production (FP) of millet at different irrigation levels and water productivity. Two experiments were conducted using millet crop sown in the 2014/2015 growing season in Santiago, Rio Grande do Sul, Brazil, and in the 2015/2016 growing season in Santa Maria, Rio Grande do Sul. The experiments were carried out using a completely randomized block design with four repetitions and six irrigation regimes (0, 25, 50, 75, 100, and 125% of reference evapotranspiration-ETo). Dry matter (DM) production of plants collected at 50, 80, 110, and 140 days after sowing and water productivity were determined. Irrigation had a significant effect on millet FP (kg DM ha-1) during the 2014/2015 and 2015/2016 growing seasons after adjusting the quadratic equation. The maximum technical efficie...

Research paper thumbnail of Furrow Irrigation for Corn Cultivation in Hydromorphic Soils

Journal of Agricultural Science

The use of crop rotation in hydromorphic soils has been intensified in the state of Rio Grande do... more The use of crop rotation in hydromorphic soils has been intensified in the state of Rio Grande do Sul, Brazil. Due to the difficult management of these soils, the use of irrigation is fundamental to increase the reliability of these production ecosystems. The present study aimed to evaluate the growth and yield components of corn under different managements of furrow irrigation. The study was conducted in Alegrete/RS in the experimental area of the Farroupilha Federal Institute during the 2017/2018 season. Two factors were evaluated: five managements of furrow irrigation, with a control (not irrigated) and 0, 25, 50 and 100% of the time required to replace the irrigation depth up to field capacity, and the influence of plant position relative to the total length of the furrow, at 0, 25 and 50 meters from its beginning. During the growth stage of corn, its LAI showed better performance for the three collections, at 34, 54 and 76 DAS, and plant height and shoot dry matter showed diffe...

Research paper thumbnail of Aspectos produtivos e eficiência no uso da água em cultivares de canola irrigada

Cultura Agronômica: Revista de Ciências Agronômicas

A cultura da canola é a segunda oleaginosa mais produzida no mundo, possuindo importância no merc... more A cultura da canola é a segunda oleaginosa mais produzida no mundo, possuindo importância no mercado mundial, principalmente pelo óleo utilizado no consumo humano e produção de biodiesel, sendo uma opção de renda ao produtor e também como alternativa de rotação de culturas. Com a irregular distribuição pluviométrica de algumas regiões, há necessidade do uso da irrigação para o suprimento hídrico adequado às plantas. Este trabalho objetiva avaliar a influência de lâminas de irrigação na produtividade, nos componentes de rendimento (número de siliquas por planta, número de grãos por siliqua e massa de mil grãos) e na eficiência do uso da água de duas cultivares de canola. O trabalho foi conduzido de junho a outubro de 2016, em delineamento experimental blocos ao acaso, com quatro repetições. O fator A foi constituído de 6 tratamentos de irrigação (0%, 25%, 50%,75%,100% e 125% da ETo), e o fator B por duas cultivares de canola (Hyola 61 e Diamond). A cultivar Diamond apresentou número ...

Research paper thumbnail of Uso De Camalhões De Base Larga Para a Viabilização Do Cultivo De Soja Em Terras Baixas

IRRIGA

USO DE CAMALHÕES DE BASE LARGA PARA A VIABILIZAÇÃO DO CULTIVO DE SOJA EM TERRAS BAIXAS RICARD... more USO DE CAMALHÕES DE BASE LARGA PARA A VIABILIZAÇÃO DO CULTIVO DE SOJA EM TERRAS BAIXAS RICARDO BENETTI ROSSO1; MARCIA XAVIER PEITER2; ADROALDO DIAS ROBAINA3; ROGÉRIO RICALDE TORRES4 E JARDEL HENRIQUE KIRCHNER5 1Eng. Agrônomo, Doutor, Professor do Instituto Federal Catarinense, Campus Concórdia, SC, Brasil, CEP: 89703-720, ricardo.rosso@ifc.edu.br. 2Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 3Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Santa Maria, RS, Brasil, CEP: 97195-000, diasrobaina@gmail.com. 4Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Vacaria, RS, Brasil, CEP: 95219-899, rogerio.torres@vacaria.ifrs.edu.br 5Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Ibirubá, RS, Brasil, CEP: 98200-000, jardel.kirch...

Research paper thumbnail of Performance of explicit approximations of the coefficient of head loss for pressurized conduits

Revista Brasileira de Engenharia Agrícola e Ambiental

One of the parameters involved in the design of pressurized hydraulic systems is the pressure dro... more One of the parameters involved in the design of pressurized hydraulic systems is the pressure drop in the pipes. The verification of the pressure drop can be performed through the Darcy-Weisbach formulation, which considers a coefficient of head loss (f) that can be estimated by the implicit Colebrook-White equation. However, for this determination, it is necessary to use numerical methods or the Moody diagram. Because of this, numerous explicit approaches have been proposed to overcome such limitation. In this sense, the objective of this study was to analyze the explicit approximations of the f for pressurized conduits in comparison to the Colebrook-White formulation, determining the most precise ones so that they can be used as an alternative solution that is valid for the turbulent flow regime. Twenty nine explicit equations found in the literature were analysed, determining the f through the Reynolds number in the range of 4 × 103 ≤ Re ≤ 108 and a relative roughness (Ɛ/D) of 10...

Research paper thumbnail of Previsão Da Produção De Milho Submetido a Diferentes Níveis De Manejo De Irrigação via Modelo De Simulação

IRRIGA

PREVISÃO DA PRODUÇÃO DE MILHO SUBMETIDO A DIFERENTES NÍVEIS DE MANEJO DE IRRIGAÇÃO VIA MODELO DE ... more PREVISÃO DA PRODUÇÃO DE MILHO SUBMETIDO A DIFERENTES NÍVEIS DE MANEJO DE IRRIGAÇÃO VIA MODELO DE SIMULAÇÃO[1] Marcia Xavier PeiterCurso de Engenharia Agrícola - Universidade Regional do Alto Uruguai e Missões - URI Campus Santiago - Tel.(055)251-1715 - Rua 20 de setembro, 2410 - Santiago, RSFazal Hussain ChaudhryDepartamento de Hidráulica e Saneamento - Escola de Engenharia de São Carlos - USPTel.(016)274-3444 - Av. Dr. Carlos Botelho, 1465 - São Carlos, SP 1 RESUMO O advento de modelos simuladores de crescimento e produção de culturas agrícolas vem permitir que as quantidades de água aplicadas e o momento de rega possam ser testados com significativas reduções de custo, tempo e mão-de-obra, além do que, a estimativa da produção não é influenciada por eventuais fatores externos, alheios ao tratamento aplicado. Desta forma, o presente trabalho tem como objetivo a avaliação, calibração e validação de um modelo de simulação de produção para a cultura do milho quando submetido a difer...

Research paper thumbnail of Water Availability and Production of Potted Alstroemeria in Greenhouse

REVISTA ENGENHARIA NA AGRICULTURA - REVENG

The amount of available water in the substrate is one of the most important factors for the growt... more The amount of available water in the substrate is one of the most important factors for the growth and development of potted ornamental species. The aim of the present study was to determine the water consumption of Alstroemeria x hybrid variety Firenze when submitted to different irrigation levels and to assess their effects on production factors. The experiment was carried out under controlled conditions of temperature at Colégio Politécnico of Universidade Federal de Santa Maria, in the state of Rio Grande do Sul, Brazil. Rhizomes of Alstroemeria x hybrid variety Firenze were transplanted into 20 liters rigid black plastic pots filled with substrate. Five treatments (90%, 75%, 60%, 45%, and 30% of container capacity) with 10 repetitions were arranged in a completely randomized design. The production components height and flowering stem diameter, number of flowers per stem, and stem fresh and dry matter content were evaluated over a year of production. Our results demonstrated an ...

Research paper thumbnail of The Use of Artificial Intelligence for Estimating Soil Resistance to Penetration

Engenharia Agrícola

The aim of this study was to present and to evaluate methodologies for the estimation of soil res... more The aim of this study was to present and to evaluate methodologies for the estimation of soil resistance to penetration (RP) using artificial intelligence prediction techniques. In order to do so, a data base with values of physical-water characteristics of the soils available in the literature was used, and the performances of Artificial Neural Networks (ANN) and Support Vector Machines (SVM) were evaluated. The models generated from the ANNs were implemented through the multilayer perceptron with backpropagation algorithm of Matlab software, varying the number of neurons in the input and intermediate layers. For the procedure from SVM, the RapidMiner software was used, varying input variables, the kernel function and the coefficients of these functions. The efficiency of the techniques was analyzed by the ratio 1:1, and later, compared to the Busscher non-linear model (Busscher, 1990). The results showed that the artificial intelligence models (ANN and SVM) are efficient and have predictive capacity superior to the Busscher model, under data conditions of soils with textural classes and different, and similar managements, although with higher performance index values for conditions of soils of the same textural class exposed to the same management.

Research paper thumbnail of Agronomic performance of maize hybrids under supplemental irrigation depths

Revista Brasileira de Engenharia Agrícola e Ambiental

The choice of a maize hybrid, considering the technology level and irrigation management, contrib... more The choice of a maize hybrid, considering the technology level and irrigation management, contributes to the improvement of the plant productivity and water use efficiency (WUE). Thus, the objective of this study was to evaluate the effects of irrigation depths on production components, grain yield, technical efficiency, and WUE in maize hybrids. The experiment was conducted in Santiago, RS state, Brazil, in the 2015/2016 and 2016/2017 crop seasons, using a randomized block design in factorial scheme, consisting of five irrigation depths (0, 50, 75, 100 and 125% of crop evapotranspiration - ETc) and four maize hybrids in crop season I (2015/2016), and six maize hybrids in crop season II (2016/2017). The number of ears per plant, number of grains per ear, 100-grain weight, grain yield, and WUE were evaluated. The irrigation depths affected the 100-grain weight, grain yield and WUE in both crop seasons, and the number of grains per ear in crop season I. The irrigation depths increased...

Research paper thumbnail of Performance of Analysis Methods of Slope Stability for Different Geotechnical Classes Soil on Earth Dams

Engenharia Agrícola

The aim of this study was to evaluate the performance of less accurate analysis methods of slope ... more The aim of this study was to evaluate the performance of less accurate analysis methods of slope stability, in order to reduce the number of operations used by the most accurate methods available in the literature. The study evaluated four methods for calculating slope stability. Fellenius (FELLENIUS, 1936), Bishop (BISHOP, 1955), Simplified Bishop (BISHOP & MORGENSTERN, 1960) and Simplified Janbu (JANBU, 1973) were compared with the Spencer method (SPENCER, 1967), which is considered an accurate method for calculating the factor of safety (FS). The procedure was performed in scenarios with different soil groups according to the Unified Soil Classification System (USCS) (ASTM 2011), heights and slope inclinations, and under conditions of reservoir subject to fast and slow emptying. Thus, comparative analyses were made using the correlation index "r", the accuracy index "d" (WILLMOTT et al, 1985) and the performance index "c" (CAMARGO & SENTELHAS, 1997). The methods that had optimal performance for the analyzed conditions were the Simplified Bishop, the Simplified Janbu and the Bishop methods; the Simplified Bishop method obtained a correlation coefficient of 99%. Thus, they can be used as alternative methods to replace the Spencer method in the analysis of slope stability on earth dams.

Research paper thumbnail of Altura De Plantas e Diâmetro De Colmos De Sorgo Forrageiro Irrigado Em Função De Cortes

IRRIGA

ALTURA DE PLANTAS E DIÂMETRO DE COLMOS DE SORGO FORRAGEIRO IRRIGADO EM FUNÇÃO DE CORTES JARDE... more ALTURA DE PLANTAS E DIÂMETRO DE COLMOS DE SORGO FORRAGEIRO IRRIGADO EM FUNÇÃO DE CORTES JARDEL HENRIQUE KIRCHNER1; ADROALDO DIAS ROBAINA2; MARCIA XAVIER PEITER3; ROGÉRIO RICALDE TORRES4; WELLINGTON MEZZOMO5 E RICARDO BENETTI ROSSO6 1 Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Rua Nelsi Ribas Fritsch, nº 1111, bairro Esperança, Ibirubá, RS, Brasil, CEP: 98200-000, jardel.kirchner@ibiruba.ifrs.edu.br. 2 Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, diasrobaina@gmail.com. 3 Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 4 Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Rua Eng. João Viterbo de O...

Research paper thumbnail of Supplementary irrigation in Sudan grass: Leaf area index, dry matter production and water use efficiency

Research paper thumbnail of Implantation Systems and Surface Irrigation for Maize Crop in Lowland Areas

Revista Brasileira de Milho e Sorgo

The raised seedbed implantation system and the use of surfaceirrigation can be important practice... more The raised seedbed implantation system and the use of surfaceirrigation can be important practices to enable rotation with rice and ensure theexpression of the productive potential of maize in lowland areas. The purpose ofthis work was to evaluate the use of implantation systems and surface irrigationon agronomic characteristics and grain yield of maize crop in lowland areas.Two experiments were conducted in the experimental lowland area of theFederal University of Santa Maria – UFSM, during the 2014/15 crop season.The experiments consisted in the use of implantation systems with and withoutraised seedbeds and surface irrigation. The evaluated characteristics were plantheight, shoot dry mass, leaf area index, yield components and grain yield. Plantheight, leaf area index and shoot dry mass are higher when maize is grown inraised seedbeds in lowland areas. The raised seedbed system can be consideredan efficient way to improve drainage in the cultivation area, resulting in a highergra...

Research paper thumbnail of Economic of the irrigated production of forage millet

Semina: Ciências Agrárias

Irrigation is an agricultural technique that increases crop yield and reduces periods of forage s... more Irrigation is an agricultural technique that increases crop yield and reduces periods of forage shortage. However, this technique increases production costs, and the process is economically viable only when costs are lower than the financial return. Determining the technical and financial viability of irrigation is essential to assess the feasibility of forage production systems. Therefore, the objective of this study was to determine the technical and financial viability of irrigated producing of forage millet in different growing seasons in two microregions of the state of Rio Grande do Sul, Brazil. The water requirements of the growing seasons of 2012 to 2017 in the microregions of Santiago and Santa Maria varied and affected the cost of irrigation. The irrigated production of forage millet increased the total average cost by 13.42% and increased the financial return by 43.03% and 22.49% in Santiago and Santa Maria, respectively.

Research paper thumbnail of Produção Forrageira e Eficiência De Utilização Da Água Do Capim Sudão Submetido a Diferentes Lâminas De IRRIGAÇÃO1

IRRIGA

PRODUÇÃO FORRAGEIRA E EFICIÊNCIA DE UTILIZAÇÃO DA ÁGUA DO CAPIM SUDÃO SUBMETIDO A DIFERENTES LÂMI... more PRODUÇÃO FORRAGEIRA E EFICIÊNCIA DE UTILIZAÇÃO DA ÁGUA DO CAPIM SUDÃO SUBMETIDO A DIFERENTES LÂMINAS DE IRRIGAÇÃO1 WELLINGTON MEZZOMO2; MARCIA XAVIER PEITER3; ADROALDO DIAS ROBAINA4; JARDEL HENRIQUE KIRCHNER5; ROGÉRIO RICALDE TORRES6 e BRUNA DALCIN PIMENTA7 1 Trabalho retirado da tese intitulada: “Viabilidade técnica e econômica da produção de forragem do capim sudão irrigado por aspersão convencional”, do autor Wellington Mezzomo2 2 Eng. Agrônomo, Mestre, Doutorando no Programa de Pós-Graduação em Engenharia Agrícola, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, wellingtonmezzomo@gmail.com. 3 Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 4 Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Avenida Roraima, nº 1000, bairro Camobi, Santa Maria, RS, Brasil, CEP: 971...

Research paper thumbnail of Economic Viability of Conventional Sprinkler Irrigation in Sudan Grass Production for Beef Cattle

Journal of Agricultural Studies

The supplementary irrigation is an alternative to ensure forage production and quality in periods... more The supplementary irrigation is an alternative to ensure forage production and quality in periods with irregular rainfall, however, is necessary to know the irrigation economic viability in order to maximize profits. The study was performed in Santa Maria, Rio Grande do Sul State in southern Brazil, during 2015/2016 and 2016/2017 agricultural years, aiming to evaluate the sudan grass economic viability under different irrigation depths, in order to define which irrigation depth (0, 25, 50, 75, 100 and 125% of the reference evapotranspiration-ETo) has the highest net revenue. Forage production functions were generated and allowed to establish the carrying capacity and production costs related to each applied irrigation depth. The forage supply was 4% of the liveweight, animals with 300 kg were considered, and average daily liveweight (LW) gains of 0.5, 1.0 and 1.5 kg LW day-1 were simulated for the conversion of dry mass production in liveweight gain per hectare. Gross revenue was de...

Research paper thumbnail of Influence of Drainage Methods on Soybean Development in Lowlands

Engenharia Agrícola

The need for crop rotation and profitability in lowland areas are the two main reasons for the in... more The need for crop rotation and profitability in lowland areas are the two main reasons for the introduction of soybean cultivation in the state of Rio Grande do Sul, Brazil. These areas have poor natural drainage, which impedes proper soybean growth. In this sense, this study aimed to assess the efficiency of using broad base ridges in comparison to the surface drainage for soybean cultivation in lowlands. The study was conducted during the 2014/2015 and 2015/2016 growing seasons in São João do Polêsine, RS, Brazil. The assessed drainage methods were the use of broad base ridges with different width dimensions (22.5, 15.0, and 7.5 m) and surface drainage. The results showed that the shoot dry matter and leaf area index have similar behavior. The broad base ridge was better than the surface drainage method for these variables. The 7.5-m broad base ridge stood out among the treatments when compared to the others, as it had the best results for the leaf area index (8.66), plant height (102.5 cm), and shoot dry matter (33.06 g).

Research paper thumbnail of Desempenho produtivo do trigo em função da densidade de semeadura e lâminas de irrigação suplementar

Cultura Agronômica: Revista de Ciências Agronômicas

Com o objetivo de avaliar o efeito de diferentes lâminas de irrigação suplementar, densidades de ... more Com o objetivo de avaliar o efeito de diferentes lâminas de irrigação suplementar, densidades de semeadura e a interação destes fatores sobre a produtividade e qualidade de grãos de trigo (Triticum aestivum L.) conduziu-se um experimento em Argissolo Amarelo distrófico típico, no município de Santa Maria - RS, nas seguintes coordenadas geográficas: 29°42'55.30" S e 53°44'22.56" O. O delineamento experimental foi o de blocos ao acaso com parcelas subdivididas, com quatro repetições, onde as parcelas foram constituídas pelas lâminas de irrigação e as subparcelas pelas diferentes densidades de semeadura. Foram estabelecidas seis lâminas de irrigação: 0, 25, 50, 75, 100 e 125% da ETo e três densidades de semeadura: 250, 350 e 450 pl m-2. A produtividade mínima de 4165 kg ha-1 foi observada no tratamento sem irrigação na densidade de 450 pl m-2 e máxima de 6894 kg ha-1 na lâmina de 100% da ETo na densidade de 350 pl m-2. A lâmina de irrigação e densidade de semeadura in...

Research paper thumbnail of Estimativa Da Radiação Solar Global Para Fins De Manejo De Irrigação

REVISTA ENGENHARIA NA AGRICULTURA - REVENG

A estimativa da radiação solar global é um dos elementos mais importantes na quantificação da dem... more A estimativa da radiação solar global é um dos elementos mais importantes na quantificação da demanda evaporativa da atmosfera e, por consequência, para o manejo de água em sistemas agrícolas. A grande maioria dos procedimentos metodológicos para estimar a radiação solar global necessita de séries de dados, muitas vezes não disponíveis. Na ausência de dados observados de Rs é possível estimá-los mediante a utilização de modelos matemáticos. Em geral, os modelos variam em grau de complexidade e nos coeficientes de ajuste, e esses devem ser calibrados para o local de interesse para obtenção do melhor desempenho. Neste sentido, o objetivo do presente estudo foi avaliar e calibrar diferentes modelos de estimativa da radiação solar global em escala diária, a partir de dados de temperatura do ar, para o município de Santa Maria - RS. Os dados foram adquiridos da estação meteorológica automática (EMA) do Instituto Nacional de Meteorologia (INMET), localizada na cidade de Santa Maria – RS. ...

Research paper thumbnail of Economically optimal water depth and grain yield of common bean subjected to different irrigation depths

Revista Brasileira de Engenharia Agrícola e Ambiental

Common bean crop plays an important role in the world, not only in economic aspects but also in s... more Common bean crop plays an important role in the world, not only in economic aspects but also in social development. The objective of this study was to evaluate the grain yield and the economically optimal water depth which reflects the maximum technical efficiency of the common bean crop. The experiment was conducted in greenhouse, in Alegrete - RS, from February to May 2016. A completely randomized design was used, consisting of five water replacement treatments (25, 50, 75, 100 and 125% crop evapotranspiration - ETc) and four replicates. Based on the obtained results, both water deficit and water excess directly affected the final grain yield of the crop. Maximum grain yield was 3,554.1 kg ha-1, obtained by applying 492.72 mm (100% ETc). On the other hand, the economically optimal water depth was estimated at 91.2% ETc, indicating that water depths above this value are not suitable for maximum technical efficiency in the common bean crop under these conditions. It was concluded th...

Research paper thumbnail of Water productivity and production function in irrigated millet crop

Semina: Ciências Agrárias

Determining the function that correlates water productivity with crop yield is essential for the ... more Determining the function that correlates water productivity with crop yield is essential for the correct sizing and management of irrigated agricultural systems. The objectives of this study are to determine forage production (FP) of millet at different irrigation levels and water productivity. Two experiments were conducted using millet crop sown in the 2014/2015 growing season in Santiago, Rio Grande do Sul, Brazil, and in the 2015/2016 growing season in Santa Maria, Rio Grande do Sul. The experiments were carried out using a completely randomized block design with four repetitions and six irrigation regimes (0, 25, 50, 75, 100, and 125% of reference evapotranspiration-ETo). Dry matter (DM) production of plants collected at 50, 80, 110, and 140 days after sowing and water productivity were determined. Irrigation had a significant effect on millet FP (kg DM ha-1) during the 2014/2015 and 2015/2016 growing seasons after adjusting the quadratic equation. The maximum technical efficie...

Research paper thumbnail of Furrow Irrigation for Corn Cultivation in Hydromorphic Soils

Journal of Agricultural Science

The use of crop rotation in hydromorphic soils has been intensified in the state of Rio Grande do... more The use of crop rotation in hydromorphic soils has been intensified in the state of Rio Grande do Sul, Brazil. Due to the difficult management of these soils, the use of irrigation is fundamental to increase the reliability of these production ecosystems. The present study aimed to evaluate the growth and yield components of corn under different managements of furrow irrigation. The study was conducted in Alegrete/RS in the experimental area of the Farroupilha Federal Institute during the 2017/2018 season. Two factors were evaluated: five managements of furrow irrigation, with a control (not irrigated) and 0, 25, 50 and 100% of the time required to replace the irrigation depth up to field capacity, and the influence of plant position relative to the total length of the furrow, at 0, 25 and 50 meters from its beginning. During the growth stage of corn, its LAI showed better performance for the three collections, at 34, 54 and 76 DAS, and plant height and shoot dry matter showed diffe...

Research paper thumbnail of Aspectos produtivos e eficiência no uso da água em cultivares de canola irrigada

Cultura Agronômica: Revista de Ciências Agronômicas

A cultura da canola é a segunda oleaginosa mais produzida no mundo, possuindo importância no merc... more A cultura da canola é a segunda oleaginosa mais produzida no mundo, possuindo importância no mercado mundial, principalmente pelo óleo utilizado no consumo humano e produção de biodiesel, sendo uma opção de renda ao produtor e também como alternativa de rotação de culturas. Com a irregular distribuição pluviométrica de algumas regiões, há necessidade do uso da irrigação para o suprimento hídrico adequado às plantas. Este trabalho objetiva avaliar a influência de lâminas de irrigação na produtividade, nos componentes de rendimento (número de siliquas por planta, número de grãos por siliqua e massa de mil grãos) e na eficiência do uso da água de duas cultivares de canola. O trabalho foi conduzido de junho a outubro de 2016, em delineamento experimental blocos ao acaso, com quatro repetições. O fator A foi constituído de 6 tratamentos de irrigação (0%, 25%, 50%,75%,100% e 125% da ETo), e o fator B por duas cultivares de canola (Hyola 61 e Diamond). A cultivar Diamond apresentou número ...

Research paper thumbnail of Uso De Camalhões De Base Larga Para a Viabilização Do Cultivo De Soja Em Terras Baixas

IRRIGA

USO DE CAMALHÕES DE BASE LARGA PARA A VIABILIZAÇÃO DO CULTIVO DE SOJA EM TERRAS BAIXAS RICARD... more USO DE CAMALHÕES DE BASE LARGA PARA A VIABILIZAÇÃO DO CULTIVO DE SOJA EM TERRAS BAIXAS RICARDO BENETTI ROSSO1; MARCIA XAVIER PEITER2; ADROALDO DIAS ROBAINA3; ROGÉRIO RICALDE TORRES4 E JARDEL HENRIQUE KIRCHNER5 1Eng. Agrônomo, Doutor, Professor do Instituto Federal Catarinense, Campus Concórdia, SC, Brasil, CEP: 89703-720, ricardo.rosso@ifc.edu.br. 2Eng. Agrônoma, Doutora, Professora Associada do Departamento de Engenharia Rural, UFSM, Santa Maria, RS, Brasil, CEP: 97195-000, mpeiter@gmail.com. 3Eng. Agrônomo, Doutor, Professor Titular do Departamento de Engenharia Rural, UFSM, Santa Maria, RS, Brasil, CEP: 97195-000, diasrobaina@gmail.com. 4Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Vacaria, RS, Brasil, CEP: 95219-899, rogerio.torres@vacaria.ifrs.edu.br 5Eng. Agrônomo, Doutor, Professor do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Ibirubá, RS, Brasil, CEP: 98200-000, jardel.kirch...

Research paper thumbnail of Performance of explicit approximations of the coefficient of head loss for pressurized conduits

Revista Brasileira de Engenharia Agrícola e Ambiental

One of the parameters involved in the design of pressurized hydraulic systems is the pressure dro... more One of the parameters involved in the design of pressurized hydraulic systems is the pressure drop in the pipes. The verification of the pressure drop can be performed through the Darcy-Weisbach formulation, which considers a coefficient of head loss (f) that can be estimated by the implicit Colebrook-White equation. However, for this determination, it is necessary to use numerical methods or the Moody diagram. Because of this, numerous explicit approaches have been proposed to overcome such limitation. In this sense, the objective of this study was to analyze the explicit approximations of the f for pressurized conduits in comparison to the Colebrook-White formulation, determining the most precise ones so that they can be used as an alternative solution that is valid for the turbulent flow regime. Twenty nine explicit equations found in the literature were analysed, determining the f through the Reynolds number in the range of 4 × 103 ≤ Re ≤ 108 and a relative roughness (Ɛ/D) of 10...

Research paper thumbnail of Previsão Da Produção De Milho Submetido a Diferentes Níveis De Manejo De Irrigação via Modelo De Simulação

IRRIGA

PREVISÃO DA PRODUÇÃO DE MILHO SUBMETIDO A DIFERENTES NÍVEIS DE MANEJO DE IRRIGAÇÃO VIA MODELO DE ... more PREVISÃO DA PRODUÇÃO DE MILHO SUBMETIDO A DIFERENTES NÍVEIS DE MANEJO DE IRRIGAÇÃO VIA MODELO DE SIMULAÇÃO[1] Marcia Xavier PeiterCurso de Engenharia Agrícola - Universidade Regional do Alto Uruguai e Missões - URI Campus Santiago - Tel.(055)251-1715 - Rua 20 de setembro, 2410 - Santiago, RSFazal Hussain ChaudhryDepartamento de Hidráulica e Saneamento - Escola de Engenharia de São Carlos - USPTel.(016)274-3444 - Av. Dr. Carlos Botelho, 1465 - São Carlos, SP 1 RESUMO O advento de modelos simuladores de crescimento e produção de culturas agrícolas vem permitir que as quantidades de água aplicadas e o momento de rega possam ser testados com significativas reduções de custo, tempo e mão-de-obra, além do que, a estimativa da produção não é influenciada por eventuais fatores externos, alheios ao tratamento aplicado. Desta forma, o presente trabalho tem como objetivo a avaliação, calibração e validação de um modelo de simulação de produção para a cultura do milho quando submetido a difer...

Research paper thumbnail of Water Availability and Production of Potted Alstroemeria in Greenhouse

REVISTA ENGENHARIA NA AGRICULTURA - REVENG

The amount of available water in the substrate is one of the most important factors for the growt... more The amount of available water in the substrate is one of the most important factors for the growth and development of potted ornamental species. The aim of the present study was to determine the water consumption of Alstroemeria x hybrid variety Firenze when submitted to different irrigation levels and to assess their effects on production factors. The experiment was carried out under controlled conditions of temperature at Colégio Politécnico of Universidade Federal de Santa Maria, in the state of Rio Grande do Sul, Brazil. Rhizomes of Alstroemeria x hybrid variety Firenze were transplanted into 20 liters rigid black plastic pots filled with substrate. Five treatments (90%, 75%, 60%, 45%, and 30% of container capacity) with 10 repetitions were arranged in a completely randomized design. The production components height and flowering stem diameter, number of flowers per stem, and stem fresh and dry matter content were evaluated over a year of production. Our results demonstrated an ...