R. Pire | Universidad Centroccidental Lisandro Alvarado (original) (raw)
Papers by R. Pire
Revista de la Facultad de Agronomia
Se determinaron las concentraciones y contenidos de nitrogeno, fosforo y potasio en momentos de l... more Se determinaron las concentraciones y contenidos de nitrogeno, fosforo y potasio en momentos de la cosecha asi como en la poda subsiguiente en los cultivares de vid ‘Queen’, ‘Tucupita’ y ‘Villanueva’ en El Tocuyo, estado Lara, con el fin de determinar los niveles de extraccion de dichos elementos durante un ciclo productivo de las plantas. Para ello se obtuvo el peso seco total y se realizaron los analisis quimicos en muestras de frutos, tallos y hojas. Se encontro que el cv. Tucupita presento los mayores niveles de extraccion. Por otra parte, la lamina foliar fue el componente de la planta que removio la mayor cantidad de nitrogeno mientras que el potasio fue principalmente extraido por el mosto y los sarmientos. La extraccion de nitrogeno vario entre 44,7 y 38,3 kg/ha por ciclo productivo. La mayor extraccion de fosforo fue de 4,8 kg/ha y la de potasio de 50,3 kg/ha en los tres cultivares. Los resultados obtenidos pueden contribuir al planeamiento de las labores de fertilizacion de vinedos cultivados en condiciones comparativas en el pais y la zona tropical en general.
Effect of different irrigation regimes on yield and quality of two melon cultivars (Cucumis melo ... more Effect of different irrigation regimes on yield and quality of two melon cultivars (Cucumis melo L.) An experiment was carried out in the farm "Las Piñas", Monagas state, Venezuela, with the objective of determining the best irrigation regime in order to obtain the best yield and fruit quality of two melon cultivars: Edisto and Honey Dew. Frour irrigation treatments were
In the tropics, the mineral nutrition of young fruit plants study is important due to the fast in... more In the tropics, the mineral nutrition of young fruit plants study is important due to the fast initial growth. With the purpose of knowing aspects of mineral nutrition of sapodilla plants, the concentrations of the main macro and micronutrients on leaves, stems and roots of one and two-year old plants grown in containers was determined. A split plot design with factorial arrangement of treatments (2 ages x 3 organs) and six replicates was used with the exception of calcium; one-year old plants had significantly higher foliar concentrations than the two years old plants. In case of stem and root, the nutrient concentrations showed similar behavior to those of leaves even though differences were greater for potassium and calcium. In general, foliar concentrations were in the range of sufficiency. Leaf was the plant organ that accumulated the higher levels of nitrogen and calcium, the stem showed the highest level of phosphorus, while the rest of the nutrients were mainly stored in root. Regardless of the plant tissue, the most absorbed macronutrients were Ca, P and N, leaving Mg and P in the lower levels. The most absorbed micronutrient was Fe followed by Zn and to a lesser extent by Mn and C. It is concluded that there is a considerable variation of nutrient levels concentration according to plant age and the analyzed tissue.
El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo q... more El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo que la extracción de nutrientes que ellos hacen es la base para establecer los programas de fertilización. El objetivo de este estudio fue evaluar el crecimiento, estado nutricional y los niveles de extracción de N, P y K en plantas de pimentón abonadas con dosis altas de estiércol de pollo. El ensayo se realizó en el campo experimental del INIA en Quibor, estado Lara, utilizando el híbrido Enterprise, el cual se trasplantó a una distancia de 0,35 m entre plantas y 1,20 m entre hileras. Cada parcela estuvo constituida por 4 hileras de 11 plantas cada una. Las parcelas fueron repetidas seis veces. El crecimiento inicial, expresado como altura y peso seco de las plantas, fue lento y el mismo aumentó rápidamente a partir de los 45 días después de la siembra (dds) mostrando un comportamiento normal en este cultivo. Se detectó una tendencia general al incremento de la concentración de N y K en...
Bioagro, 1998
... RELACIÓN CON EL PESO DE LOS FRUTOS Ana Viloria de Z., * Lis Arteaga de R. * y Reinaldo Pire *... more ... RELACIÓN CON EL PESO DE LOS FRUTOS Ana Viloria de Z., * Lis Arteaga de R. * y Reinaldo Pire ** RESUMEN ... En un trabajo previo en el mismo cultivo sobre un suelo mineral (franco),Colmenárez (1994) encontró valores de densidad de raíces muy inferiores: de ...
Crecimiento y extracción de N-P-K por plantas de pimentón (Capsicum annuum L.) abonadas con estié... more Crecimiento y extracción de N-P-K por plantas de pimentón (Capsicum annuum L.) abonadas con estiércol de pollo en Quíbor, estado Lara Growth and N-P-K removal in chicken manure fertilized bell pepper (Capsicum annuum L.) plants in Quíbor, Lara State, Venezuela Resumen El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo que la extracción de nutrientes que ellos hacen es la base para establecer los programas de fertilización. El objetivo de este estudio fue evaluar el crecimiento, estado nutricional y los niveles de extracción de N, P y K en plantas de pimentón abonadas con dosis altas de estiércol de pollo. El ensayo se realizó en el campo experimental del INIA en Quibor, estado Lara, utilizando el híbrido Enterprise, el cual se trasplantó a una distancia de 0,35 m entre plantas y 1,20 m entre hileras. Cada parcela estuvo constituida por 4 hileras de 11 plantas cada una. Las parcelas fueron repetidas seis veces. El crecimiento inicial, expr...
Agrociencia, 2007
Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Cri... more Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Criolla Negra rootstock is used in viticulture in Venezuela, but there is no information available that indicates whether it possesses or can confer drought tolerance. The objective of this study was to compare vegetative growth of the rootstock with Chenin blanc and Syrah grape varieties, grown on their own roots or grafted onto the rootstock and subjected to different levels of water deficit. The five resulting combinations of plant material were distributed in three irrigation treatments (abundant, moderate and deficient) in a completely randomized design with a factorial arrangement and 12 replications. Water deficit reduced leaf water potential in all of the materials and, at the same time, produced a slight decrease in the mass of the root system and a greater reduction of the shoot (p≤ ≤ ≤ ≤ ≤0.05), in the mass of shoots and in leaf area. The root mass of the rootstock markedly surpassed (p≤ ≤ ≤ ≤ ≤0.05) that of the varieties, regardless of whether they were grafted or grown on their own roots. Under conditions of abundant irrigation, the varieties Chenin blanc and Syrah grafted on Criolla Negra showed small, but significant, differences in growth relative to the same varieties cultivated on their own roots. Some characteristics of the rootstock that made it possible to classify it as vigorous and able to confer drought tolerance were an extensive root system (double that of the other materials in moist soil and triple under drought conditions) and greater water use efficiency under drought conditions.
1Universidad del Zulia. 2Universidad Central Lizandro Alvarado. Lara State is one of the largest ... more 1Universidad del Zulia. 2Universidad Central Lizandro Alvarado. Lara State is one of the largest cantaloupe farmers in Venezuela, thus the importance of determining the crop nutrient removal in order to program rational fertilizer practices. Cantaloupe plants hybrid Packstar were grown in Tarabana, Lara State, Venezuela, and N by microkjeldahl method, P by colorimetric analysis using ammonium-vanadate, K by flame photometry, Ca and Mg using atomic absorption spectrophotometry removal were determined based on plant dry weight and nutrient concentrations. The experiment was conducted as a randomized complete design with seven replications and fiveplant plots. During harvest time, highest level of K, Ca and Mg were found in petioles while the lowest was found in lamina, root and ripe fruits, respectively. Highest level of N and P were found in lamina and ripe fruits whereas the lowest was found in roots. Total extraction of macronutrients were 75 kg N, 7 kg P, 64 kg K, 62 kg Ca and 10 ...
To evaluate grapevine root growth, under tropical conditions during the season, is important to p... more To evaluate grapevine root growth, under tropical conditions during the season, is important to properly schedule different vineyard labors. With the objective of quantifying the development of new rootlets, soil samples were periodically collected around plants of the rootstock "Criolla Negra" in Tarabana (10o01’N, 510 m above sea level), Lara State, Venezuela. Samplings were performed at 15 cm intervals from surface to 75 cm deep in alleys and vine rows. The experiment was arranged in a factorial set of treatments with five depths and two sites per sampling. The highest root length density was found at the beginning of the season, previous to flowering, bearing a decreasing growth pattern with the lowest values during the rest of the period, following the harvest. However, two months after the high initial activity, there was a slight flush of new growth. This suggests that grapevine root that growth in the tropics has a different pattern as compared to that in temperate...
La uva de playa es importante por ser una planta que aporta multiples beneficios a los consumidor... more La uva de playa es importante por ser una planta que aporta multiples beneficios a los consumidores, esencialmente como fruto de temporada. Comercialmente se propaga por medio de estacas, pero para fines de conservacion de la especie y/o programas de restauracion, la mejor opcion es reproducirla a partir de semilla. El objetivo de este trabajo fue evaluar su germinacion en dependencia de las condiciones y tiempo de almacenamiento. Se recolectaron pseudofrutos en la localidad de Centla, Estado de Tabasco, Mexico, y los aquenios con la semilla seca fueron almacenados en dos condiciones: temperatura ambiente de laboratorio (27,2±1,8oC) y refrigeracion (4,0±1,5oC). Se evaluaron el porcentaje de germinacion, la velocidad de germinacion, el indice de vigor y el periodo de latencia de la semilla al inicio, y despues de 4, 8, 12 y 15 meses de almacenamiento. Se utilizo un diseno completamente al azar con arreglo factorial 2 x 4 mas un testigo. Los aquenios con semilla se sembraron en cajas ...
En el tropico, el estudio de la nutricion mineral de los frutales jovenes es importante dado su r... more En el tropico, el estudio de la nutricion mineral de los frutales jovenes es importante dado su rapido crecimiento inicial. Con el objeto de conocer aspectos de la nutricion mineral del nispero se determino la concentracion de los principales macro y micronutrientes en hojas, tallo y raiz utilizando plantas de uno y dos anos de edad cultivadas en contenedores. Se empleo un diseno completo al azar con arreglo factorial (2 edades x 3 tipos de tejido) y seis repeticiones. Con la excepcion del calcio, las plantas de un ano de edad presentaron concentraciones foliares significativamente superiores a las plantas de dos anos. En el caso del tallo y la raiz las concentraciones de nutrientes mostraron un comportamiento similar al de las hojas aunque las diferencias fueron mayores para el caso del potasio y calcio. En general las concentraciones foliares se ubicaron en el rango de suficiencia. La hoja fue el organo de la planta que acumulo los mayores niveles de N y Ca, el tallo mostro el may...
Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Cri... more Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Criolla Negra rootstock is used in viticulture in Venezuela, but there is no information available that indicates whether it possesses or can confer drought tolerance. The objective of this study was to compare vegetative growth of the rootstock with Chenin blanc and Syrah grape varieties, grown on their own roots or grafted onto the rootstock and subjected to different levels of water deficit. The five resulting combinations of plant material were distributed in three irrigation treatments (abundant, moderate and deficient) in a completely randomized design with a factorial arrangement and 12 replications. Water deficit reduced leaf water potential in all of the materials and, at the same time, produced a slight decrease in the mass of the root system and a greater reduction of the shoot (p≤ ≤ ≤ ≤ ≤0.05), in the mass of shoots and in leaf area. The root mass of the rootstock markedly surpassed (p≤ ≤ ≤ ≤ ≤0.05) that of the varieties, regardless of whether they were grafted or grown on their own roots. Under conditions of abundant irrigation, the varieties Chenin blanc and Syrah grafted on Criolla Negra showed small, but significant, differences in growth relative to the same varieties cultivated on their own roots. Some characteristics of the rootstock that made it possible to classify it as vigorous and able to confer drought tolerance were an extensive root system (double that of the other materials in moist soil and triple under drought conditions) and greater water use efficiency under drought conditions.
Revista de la Facultad de Agronomia
Se determinaron las concentraciones y contenidos de nitrogeno, fosforo y potasio en momentos de l... more Se determinaron las concentraciones y contenidos de nitrogeno, fosforo y potasio en momentos de la cosecha asi como en la poda subsiguiente en los cultivares de vid ‘Queen’, ‘Tucupita’ y ‘Villanueva’ en El Tocuyo, estado Lara, con el fin de determinar los niveles de extraccion de dichos elementos durante un ciclo productivo de las plantas. Para ello se obtuvo el peso seco total y se realizaron los analisis quimicos en muestras de frutos, tallos y hojas. Se encontro que el cv. Tucupita presento los mayores niveles de extraccion. Por otra parte, la lamina foliar fue el componente de la planta que removio la mayor cantidad de nitrogeno mientras que el potasio fue principalmente extraido por el mosto y los sarmientos. La extraccion de nitrogeno vario entre 44,7 y 38,3 kg/ha por ciclo productivo. La mayor extraccion de fosforo fue de 4,8 kg/ha y la de potasio de 50,3 kg/ha en los tres cultivares. Los resultados obtenidos pueden contribuir al planeamiento de las labores de fertilizacion de vinedos cultivados en condiciones comparativas en el pais y la zona tropical en general.
Effect of different irrigation regimes on yield and quality of two melon cultivars (Cucumis melo ... more Effect of different irrigation regimes on yield and quality of two melon cultivars (Cucumis melo L.) An experiment was carried out in the farm "Las Piñas", Monagas state, Venezuela, with the objective of determining the best irrigation regime in order to obtain the best yield and fruit quality of two melon cultivars: Edisto and Honey Dew. Frour irrigation treatments were
In the tropics, the mineral nutrition of young fruit plants study is important due to the fast in... more In the tropics, the mineral nutrition of young fruit plants study is important due to the fast initial growth. With the purpose of knowing aspects of mineral nutrition of sapodilla plants, the concentrations of the main macro and micronutrients on leaves, stems and roots of one and two-year old plants grown in containers was determined. A split plot design with factorial arrangement of treatments (2 ages x 3 organs) and six replicates was used with the exception of calcium; one-year old plants had significantly higher foliar concentrations than the two years old plants. In case of stem and root, the nutrient concentrations showed similar behavior to those of leaves even though differences were greater for potassium and calcium. In general, foliar concentrations were in the range of sufficiency. Leaf was the plant organ that accumulated the higher levels of nitrogen and calcium, the stem showed the highest level of phosphorus, while the rest of the nutrients were mainly stored in root. Regardless of the plant tissue, the most absorbed macronutrients were Ca, P and N, leaving Mg and P in the lower levels. The most absorbed micronutrient was Fe followed by Zn and to a lesser extent by Mn and C. It is concluded that there is a considerable variation of nutrient levels concentration according to plant age and the analyzed tissue.
El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo q... more El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo que la extracción de nutrientes que ellos hacen es la base para establecer los programas de fertilización. El objetivo de este estudio fue evaluar el crecimiento, estado nutricional y los niveles de extracción de N, P y K en plantas de pimentón abonadas con dosis altas de estiércol de pollo. El ensayo se realizó en el campo experimental del INIA en Quibor, estado Lara, utilizando el híbrido Enterprise, el cual se trasplantó a una distancia de 0,35 m entre plantas y 1,20 m entre hileras. Cada parcela estuvo constituida por 4 hileras de 11 plantas cada una. Las parcelas fueron repetidas seis veces. El crecimiento inicial, expresado como altura y peso seco de las plantas, fue lento y el mismo aumentó rápidamente a partir de los 45 días después de la siembra (dds) mostrando un comportamiento normal en este cultivo. Se detectó una tendencia general al incremento de la concentración de N y K en...
Bioagro, 1998
... RELACIÓN CON EL PESO DE LOS FRUTOS Ana Viloria de Z., * Lis Arteaga de R. * y Reinaldo Pire *... more ... RELACIÓN CON EL PESO DE LOS FRUTOS Ana Viloria de Z., * Lis Arteaga de R. * y Reinaldo Pire ** RESUMEN ... En un trabajo previo en el mismo cultivo sobre un suelo mineral (franco),Colmenárez (1994) encontró valores de densidad de raíces muy inferiores: de ...
Crecimiento y extracción de N-P-K por plantas de pimentón (Capsicum annuum L.) abonadas con estié... more Crecimiento y extracción de N-P-K por plantas de pimentón (Capsicum annuum L.) abonadas con estiércol de pollo en Quíbor, estado Lara Growth and N-P-K removal in chicken manure fertilized bell pepper (Capsicum annuum L.) plants in Quíbor, Lara State, Venezuela Resumen El crecimiento de los cultivos depende en gran medida de una adecuada nutrición mineral, por lo que la extracción de nutrientes que ellos hacen es la base para establecer los programas de fertilización. El objetivo de este estudio fue evaluar el crecimiento, estado nutricional y los niveles de extracción de N, P y K en plantas de pimentón abonadas con dosis altas de estiércol de pollo. El ensayo se realizó en el campo experimental del INIA en Quibor, estado Lara, utilizando el híbrido Enterprise, el cual se trasplantó a una distancia de 0,35 m entre plantas y 1,20 m entre hileras. Cada parcela estuvo constituida por 4 hileras de 11 plantas cada una. Las parcelas fueron repetidas seis veces. El crecimiento inicial, expr...
Agrociencia, 2007
Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Cri... more Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Criolla Negra rootstock is used in viticulture in Venezuela, but there is no information available that indicates whether it possesses or can confer drought tolerance. The objective of this study was to compare vegetative growth of the rootstock with Chenin blanc and Syrah grape varieties, grown on their own roots or grafted onto the rootstock and subjected to different levels of water deficit. The five resulting combinations of plant material were distributed in three irrigation treatments (abundant, moderate and deficient) in a completely randomized design with a factorial arrangement and 12 replications. Water deficit reduced leaf water potential in all of the materials and, at the same time, produced a slight decrease in the mass of the root system and a greater reduction of the shoot (p≤ ≤ ≤ ≤ ≤0.05), in the mass of shoots and in leaf area. The root mass of the rootstock markedly surpassed (p≤ ≤ ≤ ≤ ≤0.05) that of the varieties, regardless of whether they were grafted or grown on their own roots. Under conditions of abundant irrigation, the varieties Chenin blanc and Syrah grafted on Criolla Negra showed small, but significant, differences in growth relative to the same varieties cultivated on their own roots. Some characteristics of the rootstock that made it possible to classify it as vigorous and able to confer drought tolerance were an extensive root system (double that of the other materials in moist soil and triple under drought conditions) and greater water use efficiency under drought conditions.
1Universidad del Zulia. 2Universidad Central Lizandro Alvarado. Lara State is one of the largest ... more 1Universidad del Zulia. 2Universidad Central Lizandro Alvarado. Lara State is one of the largest cantaloupe farmers in Venezuela, thus the importance of determining the crop nutrient removal in order to program rational fertilizer practices. Cantaloupe plants hybrid Packstar were grown in Tarabana, Lara State, Venezuela, and N by microkjeldahl method, P by colorimetric analysis using ammonium-vanadate, K by flame photometry, Ca and Mg using atomic absorption spectrophotometry removal were determined based on plant dry weight and nutrient concentrations. The experiment was conducted as a randomized complete design with seven replications and fiveplant plots. During harvest time, highest level of K, Ca and Mg were found in petioles while the lowest was found in lamina, root and ripe fruits, respectively. Highest level of N and P were found in lamina and ripe fruits whereas the lowest was found in roots. Total extraction of macronutrients were 75 kg N, 7 kg P, 64 kg K, 62 kg Ca and 10 ...
To evaluate grapevine root growth, under tropical conditions during the season, is important to p... more To evaluate grapevine root growth, under tropical conditions during the season, is important to properly schedule different vineyard labors. With the objective of quantifying the development of new rootlets, soil samples were periodically collected around plants of the rootstock "Criolla Negra" in Tarabana (10o01’N, 510 m above sea level), Lara State, Venezuela. Samplings were performed at 15 cm intervals from surface to 75 cm deep in alleys and vine rows. The experiment was arranged in a factorial set of treatments with five depths and two sites per sampling. The highest root length density was found at the beginning of the season, previous to flowering, bearing a decreasing growth pattern with the lowest values during the rest of the period, following the harvest. However, two months after the high initial activity, there was a slight flush of new growth. This suggests that grapevine root that growth in the tropics has a different pattern as compared to that in temperate...
La uva de playa es importante por ser una planta que aporta multiples beneficios a los consumidor... more La uva de playa es importante por ser una planta que aporta multiples beneficios a los consumidores, esencialmente como fruto de temporada. Comercialmente se propaga por medio de estacas, pero para fines de conservacion de la especie y/o programas de restauracion, la mejor opcion es reproducirla a partir de semilla. El objetivo de este trabajo fue evaluar su germinacion en dependencia de las condiciones y tiempo de almacenamiento. Se recolectaron pseudofrutos en la localidad de Centla, Estado de Tabasco, Mexico, y los aquenios con la semilla seca fueron almacenados en dos condiciones: temperatura ambiente de laboratorio (27,2±1,8oC) y refrigeracion (4,0±1,5oC). Se evaluaron el porcentaje de germinacion, la velocidad de germinacion, el indice de vigor y el periodo de latencia de la semilla al inicio, y despues de 4, 8, 12 y 15 meses de almacenamiento. Se utilizo un diseno completamente al azar con arreglo factorial 2 x 4 mas un testigo. Los aquenios con semilla se sembraron en cajas ...
En el tropico, el estudio de la nutricion mineral de los frutales jovenes es importante dado su r... more En el tropico, el estudio de la nutricion mineral de los frutales jovenes es importante dado su rapido crecimiento inicial. Con el objeto de conocer aspectos de la nutricion mineral del nispero se determino la concentracion de los principales macro y micronutrientes en hojas, tallo y raiz utilizando plantas de uno y dos anos de edad cultivadas en contenedores. Se empleo un diseno completo al azar con arreglo factorial (2 edades x 3 tipos de tejido) y seis repeticiones. Con la excepcion del calcio, las plantas de un ano de edad presentaron concentraciones foliares significativamente superiores a las plantas de dos anos. En el caso del tallo y la raiz las concentraciones de nutrientes mostraron un comportamiento similar al de las hojas aunque las diferencias fueron mayores para el caso del potasio y calcio. En general las concentraciones foliares se ubicaron en el rango de suficiencia. La hoja fue el organo de la planta que acumulo los mayores niveles de N y Ca, el tallo mostro el may...
Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Cri... more Tolerant rootstock is used to confer plants the capacity of adaptation to drought conditions. Criolla Negra rootstock is used in viticulture in Venezuela, but there is no information available that indicates whether it possesses or can confer drought tolerance. The objective of this study was to compare vegetative growth of the rootstock with Chenin blanc and Syrah grape varieties, grown on their own roots or grafted onto the rootstock and subjected to different levels of water deficit. The five resulting combinations of plant material were distributed in three irrigation treatments (abundant, moderate and deficient) in a completely randomized design with a factorial arrangement and 12 replications. Water deficit reduced leaf water potential in all of the materials and, at the same time, produced a slight decrease in the mass of the root system and a greater reduction of the shoot (p≤ ≤ ≤ ≤ ≤0.05), in the mass of shoots and in leaf area. The root mass of the rootstock markedly surpassed (p≤ ≤ ≤ ≤ ≤0.05) that of the varieties, regardless of whether they were grafted or grown on their own roots. Under conditions of abundant irrigation, the varieties Chenin blanc and Syrah grafted on Criolla Negra showed small, but significant, differences in growth relative to the same varieties cultivated on their own roots. Some characteristics of the rootstock that made it possible to classify it as vigorous and able to confer drought tolerance were an extensive root system (double that of the other materials in moist soil and triple under drought conditions) and greater water use efficiency under drought conditions.