Jackson Kawakami | Universidade Estadual do Centro-Oeste (original) (raw)
Papers by Jackson Kawakami
Abstract: To examine the effect of the size of the potato microtuber (MT) produced in vitro on th... more Abstract: To examine the effect of the size of the potato microtuber (MT) produced in vitro on the posterior field performance, we examined the growth and yield of the late maturity cultivar Norin 1 using four sizes of MT: 0.3-0.5 g, 0.5-1 g, 1-3 g and 3-5 g, and conventional seed tubers (CT) (approximately 50 g). The experiment was conducted at Hokkaido University, Sapporo Japan in 1998 and 1999. The tubers were planted in May of each year, in a randomized block design with three replications. Plants from MT lighter than 0.5 g showed a slower initial leaf and tuber growth than heavier MT, but around the full flowering stage there was no significant difference with the MT size in leaf or tuber growth. CT plants showed higher initial leaf and tuber growth compared with MT plants, especially in 1999. No differences in growing period, number of tubers, and tuber fresh and dry yield were observed with the MT size. However, in 1999, the growing period was longer and tuber fresh and dry y...
Resistência ao esverdeamento de clones e cultivares de batata do programa de melhoramento da Embrapa Hortaliças
Neste trabalho visou-se avaliar a resistencia de genotipos de batata ao esverdeamento dos tubercu... more Neste trabalho visou-se avaliar a resistencia de genotipos de batata ao esverdeamento dos tuberculos oriundos do programa de melhoramento da Embrapa Hortaliacas, Brasilia,DF.
Adubação orgânica na cultura da batata cultivar Ágata
Research, Society and Development, 2021
Importante setor da agricultura mundial a bataticultura destaca-se por sua produção apresentar di... more Importante setor da agricultura mundial a bataticultura destaca-se por sua produção apresentar dificuldades e desafios, entre eles está o manejo adequado da fertilização, principalmente do nitrogênio, diante disso com este trabalho, objetivou-se testar fontes e doses de nitrogênio na emergência da batata cultivar Ágata, O trabalho foi realizado a campo na unidade experimental da Universidade Federal da Fronteira Sul, campus Laranjeiras do Sul, no setor de Horticultura. Foram utilizadas quatro fontes de adubação, cama de aviário curtida, cama de aviário peletizada e húmus com cinco diferentes doses, 120, 140, 160, 180, 200 kg\ha-¹, e duas testemunhas NPK 160 e 200 kg\ha-¹. As batata semente foram fornecidas pela UNICENTRO, o plantio foi realizado no mês de outubro. As variáveis foram avaliadas 14 dias após plantio, sendo contagem de tubérculos emergidos, e incidência de podridão nos tubérculos. Verificou-se a presença em 100% dos tubérculos de Pectobacterium sp. O maior percentual de...
Danos de Diabrotica speciosa Germar (Coleoptera: Chrysomelidae) em Cultivares de Batata (Solanum tuberosum L.) sob Cultivo Orgânico
Populacoes de Diabrotica speciosa sao frequentes em cultivos de batata, uma vez que os tuberculos... more Populacoes de Diabrotica speciosa sao frequentes em cultivos de batata, uma vez que os tuberculos dessa solanacea servem de alimento para as larvas, que formam orificios e galerias internas, causando a depreciacao do produto comercial. Em cultivos orgânicos, o plantio de cultivares resistentes e uma das alternativas mais promissoras para o manejo de D. speciosa, podendo restringir o numero de insetos nas areas e reduzir a demanda por outros metodos de manejo. No presente trabalho, objetivou-se avaliar os danos causados por larvas de D. speciosa em tuberculos de nove cultivares de batata recomendadas para o sistema orgânico. O experimento foi realizado na estacao experimental do Instituto Agronomico do Parana (IAPAR), em Guarapuava-PR, sendo avaliadas as cultivares Agata, Ana, Baronesa, Bel, Bintje, Catucha, Clara, Cristal e Eliza. Na area de estudos, mantida sob cultivo orgânico, as cultivares foram dispostas em tres blocos ao acaso, totalizando 27 parcelas. Os danos de larvas de D....
Cultivar de batata BRS F63 Camila tem maior produtividade em menor espaçamento de plantio
Horticultura Brasileira, 2019
As praticas fitotecnicas utilizadas no cultivo da batata se assemelham nas principais regioes pro... more As praticas fitotecnicas utilizadas no cultivo da batata se assemelham nas principais regioes produtoras do Brasil. Em locais com clima e solo distintos, comumente utiliza-se as mesmas densidades de plantio. O objetivo deste trabalho foi avaliar a produtividade de plantas de batata em resposta a diferentes cultivares e espacamentos de plantio. Foram conduzidos experimentos a campo, sendo os tratamentos constituidos de 3 cultivares (Agata, BRS Clara e BRS F63 Camila) e 3 espacamentos entre plantas (0,20, 0,25 e 0,30 m), em blocos casualizados, com 3 repeticoes em 2 anos. Foram avaliados a produtividade de tuberculos total, comercial e nao comercial, numero total e comercial de tuberculos por area e por classe de tamanho, massa media de tuberculo total e comercial e a porcentagem de materia seca dos tuberculos comerciais. BRS F63 Camila foi a cultivar mais produtiva quando espacada em 0,20 m, devido ao maior numero de tuberculos na classe comercial 100-200 g. Nos espacamentos de 0,25 ...
Desempenho Produtivo De Cultivares De Batata Modernas e Antigas, Europeias e Nacionais Em Ambientes Distintos
Horticultura Brasileira, 2018
Ha poucas informacoes sobre a produtividade comparativa das principais cultivares de batata ( Sol... more Ha poucas informacoes sobre a produtividade comparativa das principais cultivares de batata ( Solanum tuberosum L.) ja utilizadas no Brasil. O objetivo deste trabalho foi avaliar a produtividade e os componentes produtivos de cultivares de batata modernas e antigas, nacionais e europeias em ambientes distintos. Foram conduzidos dois experimentos no campo em 2013: em Guarapuava-PR, de janeiro a abril e em Brasilia-DF, de agosto a novembro. Os tratamentos foram constituidos de 6 cultivares (procedencia, ano de lancamento): 'Agata' (europeia, 1990), 'Monalisa' (europeia, 1982) e 'Bintje' (europeia, 1910); 'BRS Clara' (nacional, 2010), 'Catucha' (nacional, 1995) e 'Baronesa' (nacional, 1955), dispostos em blocos casualizados com quatro repeticoes em ambos locais. Foram avaliados o periodo de crescimento e a produtividade dos tuberculos totais e comercias, quantificando-se numero e massa. Observou-se diferenca na produtividade entre as cult...
Produtividade De Novos Genótipos De Batata Sob Diferentes Doses De Fertilizante NPK
Este trabalho objetivou determinar a produtividade de cultivares (Agata e BRS Camila) e clone (C0... more Este trabalho objetivou determinar a produtividade de cultivares (Agata e BRS Camila) e clone (C0205) de batata, submetidos a quatro doses de fertilizante NPK 4-14-8 (0, 2, 4 e 6 t ha -1 ) nos anos agricolas de 2013/14 e 2014/15. Avaliou-se a produtividade total e comercial, numero de tuberculo total e comercial, porcentagem de massa seca de tuberculo comercial e periodo de crescimento. O delineamento experimental foi de blocos ao acaso com parcela subdividida, sendo as doses de fertilizantes alocadas na parcela e os genotipos na subparcela, com tres repeticoes. Nao se observou interacao significativa para nenhum fator analisado. O clone C0205 apresentou maior produtividade comercial e total que as demais cultivares, principalmente devido ao maior numero de tuberculos produzidos. Entretanto observou-se alta quantidade de tuberculos fora do padrao comercial no clone C0205. A cultivar BRS Camila produziu menor numero de tuberculo comercial que a cultivar Agata no ano agricola de 2014/...
Apesar do percevejo Dichelops melacanthus nao ser considerado uma praga chave na cultura do milho... more Apesar do percevejo Dichelops melacanthus nao ser considerado uma praga chave na cultura do milho, ultimamente este inseto e encontrado com mais frequencia nesta cultura. O objetivo deste trabalho foi verificar o efeito de diferentes niveis populacionais do percevejo D. melacanthus , sobre plantas de milho. Para tanto, experimentos em casa de vegetacao e a campo foram conduzidos testando-se 4 diferentes populacoes do inseto: 0 (testemunha), 1, 2 e 4 percevejos infestados no estadio V2, durante 15 dias, em 10 plantas vaso -1 (casa de vegetacao) ou em 10 plantas m -2 (campo). Avaliou-se parâmetros morfologicos, producao de massa seca de planta, nivel de dano, produtividade final de graos e nivel de dano economico. Os experimentos contaram com quatro repeticoes distribuidos no delineamento experimental inteiramente casualizado (casa de vegetacao) ou em blocos ao acaso (campo). Os dados foram submetidos a analise de variância, teste de Tukey ou analise de regressao a 5% de probabilidade...
Effects of Soil Water Condition on the Growth and Yield Performance of Potato Microtuber
The different potato planting dates in southern Brazil have different climatic factors that affec... more The different potato planting dates in southern Brazil have different climatic factors that affect the yield and quality of the tubers produced. The objective of this work was to test the effect of planting date and potato cultivars on the postharvest greening of tubers. The treatments consisted of three planting dates (October, December, and February) and three potato cultivars (Agata, BRS Clara, and BRS F63 Camila). It was observed that the tubers harvested in February were less susceptible to greening, probably due to the higher physiological maturity of the tubers produced in this planting date. Tubers of cv. BRS Clara had lower greening than the tubers of the other cultivars. In addition to the light conditions, the cultivar and storage air temperature are also important factors that affect greening rates. Care must be taken with these factors to avoid losses of tubers by greening.
A method to estimate the damage of Diabrotica speciosa larvae on potato tubers
Horticultura Brasileira
The marketable value of potato tubers is affected by damage caused by Diabrotica speciosa, whose ... more The marketable value of potato tubers is affected by damage caused by Diabrotica speciosa, whose larvae create holes on the tubers’ skin and internal feeding tunnels. The estimation of potato tuber damage is usually performed by assessing the external damage to the detriment of feeding tunnels caused by larvae. Thus, we propose a method to estimate the damage caused by D. speciosa larvae, considering the external and internal aspects of the tubers separately. For that, potato plants cv. Agata were grown under different infestations of larvae, measuring the area occupied by the holes and the volume of internal feeding tunnels, relating these data to the total area and volume of the tuber. The methodology used allowed us to characterize an increase in damage in tubers with the highest infestation of larvae. The correlation between internal and external damage caused by D. speciosa larvae was not significant, indicating that external damage alone is not an adequate parameter for the di...
Research, Society and Development
Soybean seeding rate (SR) is commonly subject to genotype x environment interactions, and charact... more Soybean seeding rate (SR) is commonly subject to genotype x environment interactions, and characterization of this interaction is necessary to improve yield potential of future cultivars, especially in late sowing. The objectives of this study were to evaluate yield and yield components of three soybean cultivars in different SR under late sowing in Southern Brazil. We observed an interaction between SR and cultivars under late sowing, in which the increase from 25 to 45 seeds m-2 increased yield by 12% and 23% for cultivars BMX Energia and TMG 7262, respectively, while for cultivar AFS 110 there was no SR effect. The cultivars used in this study can be classified from more to less responsive to SR in late sowing as follows: TMG 7262 > BMX Energia > AFS 110. Also, the cultivars used in this study can be classified from higher to lower yield potential in late sowing as follows: TMG 7262 > AFS 110 > BMX Energia. The yield components most correlated to yield were as follows...
Research, Society and Development
Grain yield of bean (Phaseolus vulgaris L.) is affected by biotic and abiotic conditions, as well... more Grain yield of bean (Phaseolus vulgaris L.) is affected by biotic and abiotic conditions, as well as by farmers' management. In the Center-South region of Parana State, the successive cultivation of black bean cultivars is common. The objective of this study was to evaluate the growth and yield of six black bean cultivars after successive monocultivation. The experiment was conducted in the field with six black bean cultivars and four repetitions (blocks). The cultivar with the highest grain yield was BRS Esplendor, a cultivar with a high number of grains per area. IPR Tuiuiú had the second-best grain yield because of its high harvest index. The continuous monocultivation resulted in low grain yield because of the high incidence of Colletotrichum lindemuthianum. Although common, the practice of continuous monocultivation of black bean cultivars in the Center-South region of Parana results in low grain yield and should be avoided.
Summa Phytopathologica
Field experiments were conducted during spring 2014 and fall and spring 2015 to determine the eff... more Field experiments were conducted during spring 2014 and fall and spring 2015 to determine the effect of fresh mulch on the development of Phytophthora infestans epidemics, in Lapa Municipality, Parana State, southern Brazil. The used cultivars were ‘Agata’, susceptible, and ‘BRS Ana’, moderately susceptible. The main treatment consisted in manually applying a 10cm-thick layer of fresh mulch when potato sprouts were emerging. Fresh mulch was prepared with plants available at that time of the year. For the spring experiments, fresh mulch was a mixture of oats, rye grass and wild radish (60 t/ha) and for the fall experiment, semi-ripe elephant grass (90 t/ha). Plots consisted of six 10m-long rows, spaced at 0.8m, containing 28 plants per row. Experimental design was in completely randomized blocks with four replicates. Natural inoculum was adopted. Percentage of leaf area was weekly estimated until the end of the plant cycle and the area under the disease progress curve (AUDPC) was cal...
Research, Society and Development
In vitro propagation and tissue culture technique is an alternative for obtaining healthy potato ... more In vitro propagation and tissue culture technique is an alternative for obtaining healthy potato seeds. However, data found in the literature differ on the optimal consistency of the culture medium to be used in vitro. The aim in this research was to look at the adaptation of potato cultivars to medium with different agar concentrations. The experimental design was entirely randomized in a factorial scheme. The experiment tested the effect of 3 agar medium concentrations (solid, semisolid and liquid) on 6 cultivars (Agata, Bel, Camila, Catucha, Clara and Eliza), with 5 repetitions. We quantified from the plantlets, fresh and dry mass of roots and shoot, the number of nodes, the multiplication capacity and vigor. The study showed that potato cultivars respond significantly to different concentrations of agar and their best response was in the semisolid medium.
Pesquisa Agropecuária Tropical
The organic production system for potato is usually limited by the occurrence of diseases and nut... more The organic production system for potato is usually limited by the occurrence of diseases and nutrient shortage. In these cases, fresh grass mulch and organic fertilization can interact in the foliar late blight infestation and increase the yield and quality of marketable potato tubers, in the organic production system. Aiming to validate this hypothesis, four poultry litter doses (0 Mg ha-1, 10 Mg ha-1, 20 Mg ha-1 and 30 Mg ha-1), which were incorporated into the soil at the pre-planting stage of organic grown potato combined with the presence and absence of fresh mulch (60 Mg ha-1) composed of chopped Elephant grass, were tested. The incorporation of poultry litter into the soil at the pre-planting of potato or the use of fresh grass mulch after the potato hilling inhibits the late blight infestation on leaves, in the organic system. The application of fresh grass mulch after the hilling operation enhances the effect of organic fertilization at the pre-planting of potatoes. The pr...
Horticultura Brasileira
The objective of this work was to evaluate the effect of different planting dates on the morpholo... more The objective of this work was to evaluate the effect of different planting dates on the morphological variables and yield of new potato cultivars. The treatments were three cultivars (Agata, BRS Clara and BRS F63 Camila) and three planting date (October, December and February), carried out in two crop years (2014/15 and 2015/16). Total and marketable yields, average mass of total and marketable tubers, growth period, leaf area index, number and dry weight of the tubers were evaluated. The first planting date resulted in higher yield than the third date. Cultivar BRS F63 Camila was the one with highest yield in this first planting date (47.4 t ha-1), due to greater number of tubers produced in relation to the other cultivars and to higher average tuber weight (166 g tuber-1) in relation to Agata (113 g tuber-1). In the second planting date, no difference in yield was observed among cultivars. In the third planting date, BRS Clara was the cultivar with highest yield (21.3 t ha-1), du...
Gypsum Rates and Splitting Under No-Till: Soil Fertility, Corn Performance, Accumulated Yield and Profits
Journal of Soil Science and Plant Nutrition
Horticultura Brasileira
The fertilization of potato crops generally does not take into account the genotype, although gen... more The fertilization of potato crops generally does not take into account the genotype, although genotypes may respond differently to fertilization. This study aimed to determine the yield of new potato genotypes (cultivar BRS Camila and clone CL 02-05), as well as the cultivar Ágata, submitted to four NPK 4-14-8 fertilizer doses (0, 2, 4 and 6 t ha-1) in the crop seasons of 2013/14 and 2014/15. We evaluated the total and marketable tuber yield, total and marketable tuber number, percentage of marketable tuber dry weight, average marketable tuber weight and plant growth period. The experimental design was randomized blocks in split plot scheme, with fertilizer doses allocated as main plots and genotypes as subplots, with three replications. We did not observe significant interaction for any analyzed variable. The clone CL 02-05 showed higher total and marketable tuber yield compared to the other cultivars, mainly due to its higher production of tuber number. However, we observed a high...
Horticultura Brasileira
Little information on the comparative yield of the main potato cultivars (Solanum tuberosum subsp... more Little information on the comparative yield of the main potato cultivars (Solanum tuberosum subsp. tuberosum) used in Brazil is available. The objective of this study was to evaluate the performance of modern and old, European and Brazilian potato cultivars in different environments. Two experiments were carried in the field in 2013, in Brazil: in Guarapuava, in the state of Paraná, from January to April; and in Brasília, the Federal District, from August to November. Treatments consisted of six cultivars (origin, year of release): Bintje (European, 1910), Monalisa (European, 1982) and Agata (European, 1990); Baronesa (Brazilian, 1955), Catucha (Brazilian, 1995) and BRS Clara (Brazilian, 2010), arranged in complete blocks at random, with four replications, in both areas. Growth cycle, total and commercial yield (number of tubers and mass), tuber average weight and tuber dry matter content were evaluated. We observed significant differences in yield among cultivars, both in Guarapuav...
Abstract: To examine the effect of the size of the potato microtuber (MT) produced in vitro on th... more Abstract: To examine the effect of the size of the potato microtuber (MT) produced in vitro on the posterior field performance, we examined the growth and yield of the late maturity cultivar Norin 1 using four sizes of MT: 0.3-0.5 g, 0.5-1 g, 1-3 g and 3-5 g, and conventional seed tubers (CT) (approximately 50 g). The experiment was conducted at Hokkaido University, Sapporo Japan in 1998 and 1999. The tubers were planted in May of each year, in a randomized block design with three replications. Plants from MT lighter than 0.5 g showed a slower initial leaf and tuber growth than heavier MT, but around the full flowering stage there was no significant difference with the MT size in leaf or tuber growth. CT plants showed higher initial leaf and tuber growth compared with MT plants, especially in 1999. No differences in growing period, number of tubers, and tuber fresh and dry yield were observed with the MT size. However, in 1999, the growing period was longer and tuber fresh and dry y...
Resistência ao esverdeamento de clones e cultivares de batata do programa de melhoramento da Embrapa Hortaliças
Neste trabalho visou-se avaliar a resistencia de genotipos de batata ao esverdeamento dos tubercu... more Neste trabalho visou-se avaliar a resistencia de genotipos de batata ao esverdeamento dos tuberculos oriundos do programa de melhoramento da Embrapa Hortaliacas, Brasilia,DF.
Adubação orgânica na cultura da batata cultivar Ágata
Research, Society and Development, 2021
Importante setor da agricultura mundial a bataticultura destaca-se por sua produção apresentar di... more Importante setor da agricultura mundial a bataticultura destaca-se por sua produção apresentar dificuldades e desafios, entre eles está o manejo adequado da fertilização, principalmente do nitrogênio, diante disso com este trabalho, objetivou-se testar fontes e doses de nitrogênio na emergência da batata cultivar Ágata, O trabalho foi realizado a campo na unidade experimental da Universidade Federal da Fronteira Sul, campus Laranjeiras do Sul, no setor de Horticultura. Foram utilizadas quatro fontes de adubação, cama de aviário curtida, cama de aviário peletizada e húmus com cinco diferentes doses, 120, 140, 160, 180, 200 kg\ha-¹, e duas testemunhas NPK 160 e 200 kg\ha-¹. As batata semente foram fornecidas pela UNICENTRO, o plantio foi realizado no mês de outubro. As variáveis foram avaliadas 14 dias após plantio, sendo contagem de tubérculos emergidos, e incidência de podridão nos tubérculos. Verificou-se a presença em 100% dos tubérculos de Pectobacterium sp. O maior percentual de...
Danos de Diabrotica speciosa Germar (Coleoptera: Chrysomelidae) em Cultivares de Batata (Solanum tuberosum L.) sob Cultivo Orgânico
Populacoes de Diabrotica speciosa sao frequentes em cultivos de batata, uma vez que os tuberculos... more Populacoes de Diabrotica speciosa sao frequentes em cultivos de batata, uma vez que os tuberculos dessa solanacea servem de alimento para as larvas, que formam orificios e galerias internas, causando a depreciacao do produto comercial. Em cultivos orgânicos, o plantio de cultivares resistentes e uma das alternativas mais promissoras para o manejo de D. speciosa, podendo restringir o numero de insetos nas areas e reduzir a demanda por outros metodos de manejo. No presente trabalho, objetivou-se avaliar os danos causados por larvas de D. speciosa em tuberculos de nove cultivares de batata recomendadas para o sistema orgânico. O experimento foi realizado na estacao experimental do Instituto Agronomico do Parana (IAPAR), em Guarapuava-PR, sendo avaliadas as cultivares Agata, Ana, Baronesa, Bel, Bintje, Catucha, Clara, Cristal e Eliza. Na area de estudos, mantida sob cultivo orgânico, as cultivares foram dispostas em tres blocos ao acaso, totalizando 27 parcelas. Os danos de larvas de D....
Cultivar de batata BRS F63 Camila tem maior produtividade em menor espaçamento de plantio
Horticultura Brasileira, 2019
As praticas fitotecnicas utilizadas no cultivo da batata se assemelham nas principais regioes pro... more As praticas fitotecnicas utilizadas no cultivo da batata se assemelham nas principais regioes produtoras do Brasil. Em locais com clima e solo distintos, comumente utiliza-se as mesmas densidades de plantio. O objetivo deste trabalho foi avaliar a produtividade de plantas de batata em resposta a diferentes cultivares e espacamentos de plantio. Foram conduzidos experimentos a campo, sendo os tratamentos constituidos de 3 cultivares (Agata, BRS Clara e BRS F63 Camila) e 3 espacamentos entre plantas (0,20, 0,25 e 0,30 m), em blocos casualizados, com 3 repeticoes em 2 anos. Foram avaliados a produtividade de tuberculos total, comercial e nao comercial, numero total e comercial de tuberculos por area e por classe de tamanho, massa media de tuberculo total e comercial e a porcentagem de materia seca dos tuberculos comerciais. BRS F63 Camila foi a cultivar mais produtiva quando espacada em 0,20 m, devido ao maior numero de tuberculos na classe comercial 100-200 g. Nos espacamentos de 0,25 ...
Desempenho Produtivo De Cultivares De Batata Modernas e Antigas, Europeias e Nacionais Em Ambientes Distintos
Horticultura Brasileira, 2018
Ha poucas informacoes sobre a produtividade comparativa das principais cultivares de batata ( Sol... more Ha poucas informacoes sobre a produtividade comparativa das principais cultivares de batata ( Solanum tuberosum L.) ja utilizadas no Brasil. O objetivo deste trabalho foi avaliar a produtividade e os componentes produtivos de cultivares de batata modernas e antigas, nacionais e europeias em ambientes distintos. Foram conduzidos dois experimentos no campo em 2013: em Guarapuava-PR, de janeiro a abril e em Brasilia-DF, de agosto a novembro. Os tratamentos foram constituidos de 6 cultivares (procedencia, ano de lancamento): 'Agata' (europeia, 1990), 'Monalisa' (europeia, 1982) e 'Bintje' (europeia, 1910); 'BRS Clara' (nacional, 2010), 'Catucha' (nacional, 1995) e 'Baronesa' (nacional, 1955), dispostos em blocos casualizados com quatro repeticoes em ambos locais. Foram avaliados o periodo de crescimento e a produtividade dos tuberculos totais e comercias, quantificando-se numero e massa. Observou-se diferenca na produtividade entre as cult...
Produtividade De Novos Genótipos De Batata Sob Diferentes Doses De Fertilizante NPK
Este trabalho objetivou determinar a produtividade de cultivares (Agata e BRS Camila) e clone (C0... more Este trabalho objetivou determinar a produtividade de cultivares (Agata e BRS Camila) e clone (C0205) de batata, submetidos a quatro doses de fertilizante NPK 4-14-8 (0, 2, 4 e 6 t ha -1 ) nos anos agricolas de 2013/14 e 2014/15. Avaliou-se a produtividade total e comercial, numero de tuberculo total e comercial, porcentagem de massa seca de tuberculo comercial e periodo de crescimento. O delineamento experimental foi de blocos ao acaso com parcela subdividida, sendo as doses de fertilizantes alocadas na parcela e os genotipos na subparcela, com tres repeticoes. Nao se observou interacao significativa para nenhum fator analisado. O clone C0205 apresentou maior produtividade comercial e total que as demais cultivares, principalmente devido ao maior numero de tuberculos produzidos. Entretanto observou-se alta quantidade de tuberculos fora do padrao comercial no clone C0205. A cultivar BRS Camila produziu menor numero de tuberculo comercial que a cultivar Agata no ano agricola de 2014/...
Apesar do percevejo Dichelops melacanthus nao ser considerado uma praga chave na cultura do milho... more Apesar do percevejo Dichelops melacanthus nao ser considerado uma praga chave na cultura do milho, ultimamente este inseto e encontrado com mais frequencia nesta cultura. O objetivo deste trabalho foi verificar o efeito de diferentes niveis populacionais do percevejo D. melacanthus , sobre plantas de milho. Para tanto, experimentos em casa de vegetacao e a campo foram conduzidos testando-se 4 diferentes populacoes do inseto: 0 (testemunha), 1, 2 e 4 percevejos infestados no estadio V2, durante 15 dias, em 10 plantas vaso -1 (casa de vegetacao) ou em 10 plantas m -2 (campo). Avaliou-se parâmetros morfologicos, producao de massa seca de planta, nivel de dano, produtividade final de graos e nivel de dano economico. Os experimentos contaram com quatro repeticoes distribuidos no delineamento experimental inteiramente casualizado (casa de vegetacao) ou em blocos ao acaso (campo). Os dados foram submetidos a analise de variância, teste de Tukey ou analise de regressao a 5% de probabilidade...
Effects of Soil Water Condition on the Growth and Yield Performance of Potato Microtuber
The different potato planting dates in southern Brazil have different climatic factors that affec... more The different potato planting dates in southern Brazil have different climatic factors that affect the yield and quality of the tubers produced. The objective of this work was to test the effect of planting date and potato cultivars on the postharvest greening of tubers. The treatments consisted of three planting dates (October, December, and February) and three potato cultivars (Agata, BRS Clara, and BRS F63 Camila). It was observed that the tubers harvested in February were less susceptible to greening, probably due to the higher physiological maturity of the tubers produced in this planting date. Tubers of cv. BRS Clara had lower greening than the tubers of the other cultivars. In addition to the light conditions, the cultivar and storage air temperature are also important factors that affect greening rates. Care must be taken with these factors to avoid losses of tubers by greening.
A method to estimate the damage of Diabrotica speciosa larvae on potato tubers
Horticultura Brasileira
The marketable value of potato tubers is affected by damage caused by Diabrotica speciosa, whose ... more The marketable value of potato tubers is affected by damage caused by Diabrotica speciosa, whose larvae create holes on the tubers’ skin and internal feeding tunnels. The estimation of potato tuber damage is usually performed by assessing the external damage to the detriment of feeding tunnels caused by larvae. Thus, we propose a method to estimate the damage caused by D. speciosa larvae, considering the external and internal aspects of the tubers separately. For that, potato plants cv. Agata were grown under different infestations of larvae, measuring the area occupied by the holes and the volume of internal feeding tunnels, relating these data to the total area and volume of the tuber. The methodology used allowed us to characterize an increase in damage in tubers with the highest infestation of larvae. The correlation between internal and external damage caused by D. speciosa larvae was not significant, indicating that external damage alone is not an adequate parameter for the di...
Research, Society and Development
Soybean seeding rate (SR) is commonly subject to genotype x environment interactions, and charact... more Soybean seeding rate (SR) is commonly subject to genotype x environment interactions, and characterization of this interaction is necessary to improve yield potential of future cultivars, especially in late sowing. The objectives of this study were to evaluate yield and yield components of three soybean cultivars in different SR under late sowing in Southern Brazil. We observed an interaction between SR and cultivars under late sowing, in which the increase from 25 to 45 seeds m-2 increased yield by 12% and 23% for cultivars BMX Energia and TMG 7262, respectively, while for cultivar AFS 110 there was no SR effect. The cultivars used in this study can be classified from more to less responsive to SR in late sowing as follows: TMG 7262 > BMX Energia > AFS 110. Also, the cultivars used in this study can be classified from higher to lower yield potential in late sowing as follows: TMG 7262 > AFS 110 > BMX Energia. The yield components most correlated to yield were as follows...
Research, Society and Development
Grain yield of bean (Phaseolus vulgaris L.) is affected by biotic and abiotic conditions, as well... more Grain yield of bean (Phaseolus vulgaris L.) is affected by biotic and abiotic conditions, as well as by farmers' management. In the Center-South region of Parana State, the successive cultivation of black bean cultivars is common. The objective of this study was to evaluate the growth and yield of six black bean cultivars after successive monocultivation. The experiment was conducted in the field with six black bean cultivars and four repetitions (blocks). The cultivar with the highest grain yield was BRS Esplendor, a cultivar with a high number of grains per area. IPR Tuiuiú had the second-best grain yield because of its high harvest index. The continuous monocultivation resulted in low grain yield because of the high incidence of Colletotrichum lindemuthianum. Although common, the practice of continuous monocultivation of black bean cultivars in the Center-South region of Parana results in low grain yield and should be avoided.
Summa Phytopathologica
Field experiments were conducted during spring 2014 and fall and spring 2015 to determine the eff... more Field experiments were conducted during spring 2014 and fall and spring 2015 to determine the effect of fresh mulch on the development of Phytophthora infestans epidemics, in Lapa Municipality, Parana State, southern Brazil. The used cultivars were ‘Agata’, susceptible, and ‘BRS Ana’, moderately susceptible. The main treatment consisted in manually applying a 10cm-thick layer of fresh mulch when potato sprouts were emerging. Fresh mulch was prepared with plants available at that time of the year. For the spring experiments, fresh mulch was a mixture of oats, rye grass and wild radish (60 t/ha) and for the fall experiment, semi-ripe elephant grass (90 t/ha). Plots consisted of six 10m-long rows, spaced at 0.8m, containing 28 plants per row. Experimental design was in completely randomized blocks with four replicates. Natural inoculum was adopted. Percentage of leaf area was weekly estimated until the end of the plant cycle and the area under the disease progress curve (AUDPC) was cal...
Research, Society and Development
In vitro propagation and tissue culture technique is an alternative for obtaining healthy potato ... more In vitro propagation and tissue culture technique is an alternative for obtaining healthy potato seeds. However, data found in the literature differ on the optimal consistency of the culture medium to be used in vitro. The aim in this research was to look at the adaptation of potato cultivars to medium with different agar concentrations. The experimental design was entirely randomized in a factorial scheme. The experiment tested the effect of 3 agar medium concentrations (solid, semisolid and liquid) on 6 cultivars (Agata, Bel, Camila, Catucha, Clara and Eliza), with 5 repetitions. We quantified from the plantlets, fresh and dry mass of roots and shoot, the number of nodes, the multiplication capacity and vigor. The study showed that potato cultivars respond significantly to different concentrations of agar and their best response was in the semisolid medium.
Pesquisa Agropecuária Tropical
The organic production system for potato is usually limited by the occurrence of diseases and nut... more The organic production system for potato is usually limited by the occurrence of diseases and nutrient shortage. In these cases, fresh grass mulch and organic fertilization can interact in the foliar late blight infestation and increase the yield and quality of marketable potato tubers, in the organic production system. Aiming to validate this hypothesis, four poultry litter doses (0 Mg ha-1, 10 Mg ha-1, 20 Mg ha-1 and 30 Mg ha-1), which were incorporated into the soil at the pre-planting stage of organic grown potato combined with the presence and absence of fresh mulch (60 Mg ha-1) composed of chopped Elephant grass, were tested. The incorporation of poultry litter into the soil at the pre-planting of potato or the use of fresh grass mulch after the potato hilling inhibits the late blight infestation on leaves, in the organic system. The application of fresh grass mulch after the hilling operation enhances the effect of organic fertilization at the pre-planting of potatoes. The pr...
Horticultura Brasileira
The objective of this work was to evaluate the effect of different planting dates on the morpholo... more The objective of this work was to evaluate the effect of different planting dates on the morphological variables and yield of new potato cultivars. The treatments were three cultivars (Agata, BRS Clara and BRS F63 Camila) and three planting date (October, December and February), carried out in two crop years (2014/15 and 2015/16). Total and marketable yields, average mass of total and marketable tubers, growth period, leaf area index, number and dry weight of the tubers were evaluated. The first planting date resulted in higher yield than the third date. Cultivar BRS F63 Camila was the one with highest yield in this first planting date (47.4 t ha-1), due to greater number of tubers produced in relation to the other cultivars and to higher average tuber weight (166 g tuber-1) in relation to Agata (113 g tuber-1). In the second planting date, no difference in yield was observed among cultivars. In the third planting date, BRS Clara was the cultivar with highest yield (21.3 t ha-1), du...
Gypsum Rates and Splitting Under No-Till: Soil Fertility, Corn Performance, Accumulated Yield and Profits
Journal of Soil Science and Plant Nutrition
Horticultura Brasileira
The fertilization of potato crops generally does not take into account the genotype, although gen... more The fertilization of potato crops generally does not take into account the genotype, although genotypes may respond differently to fertilization. This study aimed to determine the yield of new potato genotypes (cultivar BRS Camila and clone CL 02-05), as well as the cultivar Ágata, submitted to four NPK 4-14-8 fertilizer doses (0, 2, 4 and 6 t ha-1) in the crop seasons of 2013/14 and 2014/15. We evaluated the total and marketable tuber yield, total and marketable tuber number, percentage of marketable tuber dry weight, average marketable tuber weight and plant growth period. The experimental design was randomized blocks in split plot scheme, with fertilizer doses allocated as main plots and genotypes as subplots, with three replications. We did not observe significant interaction for any analyzed variable. The clone CL 02-05 showed higher total and marketable tuber yield compared to the other cultivars, mainly due to its higher production of tuber number. However, we observed a high...
Horticultura Brasileira
Little information on the comparative yield of the main potato cultivars (Solanum tuberosum subsp... more Little information on the comparative yield of the main potato cultivars (Solanum tuberosum subsp. tuberosum) used in Brazil is available. The objective of this study was to evaluate the performance of modern and old, European and Brazilian potato cultivars in different environments. Two experiments were carried in the field in 2013, in Brazil: in Guarapuava, in the state of Paraná, from January to April; and in Brasília, the Federal District, from August to November. Treatments consisted of six cultivars (origin, year of release): Bintje (European, 1910), Monalisa (European, 1982) and Agata (European, 1990); Baronesa (Brazilian, 1955), Catucha (Brazilian, 1995) and BRS Clara (Brazilian, 2010), arranged in complete blocks at random, with four replications, in both areas. Growth cycle, total and commercial yield (number of tubers and mass), tuber average weight and tuber dry matter content were evaluated. We observed significant differences in yield among cultivars, both in Guarapuav...