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Search Results: 1 - 10 of 22790 matches for " MONNERAT PEDRO HENRIQUE "
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Diagnosis of Boron Deficiency in Green Dwarf Coconut Palm  [PDF]
Leandro Glaydson da Rocha Pinho, Pedro Henrique Monnerat, André Assis Pires, Marta Simone Mendon?a Freitas, Claudio Roberto Marciano
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.61015
Abstract: The diagnosis of boron deficiency in coconut palms has been hampered by lack of information about its distribution in the plant. Two experiments were conducted, one in a greenhouse to induce boron deficiency in dwarf green coconut palms, and other in the field, in which the plants received doses of boric acid, B(OH)3. The objective was to verify symptoms of boron deficiency and boron content variation in canopy, leaves and folioles (or leaflets). Boron deficient plants led leaves and folioles to become deformed. The deficient and sufficient contents of boron varied significantly in the canopy, but did not vary in leaves. The boron content increased significantly from bottom to the apex of the folioles in both treatments. To survey the level of boron in the coconut palm, the ideal is, using samples taken from the youngest leaf, to calculate the relation between the boron content in the apex of the foliole and the content in the center or in the folioles bottom, with minimum values 2.2 or 2.7, respectively.
Exporta??o de nutrientes nos tubérculos de batata em fun??o de doses de sulfato de potássio
Júnior, Roberto Anjos Reis;Monnerat, Pedro Henrique;
Horticultura Brasileira , 2001, DOI: 10.1590/S0102-05362001000300015
Abstract: removal of nutrients by potato tubers was evaluated in response to the application of potassium sulphate to potato crops. potassium was applied at six different rates (0; 60; 120; 240; 480 and 960 kg ha-1 of k2o), as k2so4 and placed during planting time in the furrow. two plants/plot were sampled 20 days after plant emergence (dae), 48 dae and at harvest to evaluate n, p, k, ca, mg, s, cl, mn and zn contents and removal by the tubers. a factorial (6x3), with six k2o rates and three sampling times was set up in a randomized block design with four replications. the application of k2so4 increased cl, mn and zn concentration in potato tuber. increasing k2so4 fertilization affected potato tuber removal of nutrients only at harvest, when the application of potassium fertilizer increased the removal of k, ca, mg, s, mn and cl. at maximum tuber yield, nutrient removal were: 99.1 kg ha-1 n; 14.2 kg ha-1 p; 118.5 kg ha-1 k; 2.10 kg ha-1 ca; 6.50 kg ha-1 mg; 9.28 kg ha-1 s; 8.18 kg ha-1 cl; 47.8 g ha-1 mn and 102.5 g ha-1 zn. nutrient removal by tubers represents an important source of nutrient loss from the soil, and its evaluation should be used to calibrate fertilizer recommendations.
Norms establishment of the Diagnosis and Recommendation Integrated System (DRIS) for nutritional diagnosis of sugarcane
Reis Junior, Roberto dos Anjos;Monnerat, Pedro Henrique;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000200015
Abstract: the objectives of this study were to establish dris norms for sugarcane crop, to compare mean yield, foliar nutrient contents and variance of nutrient ratios of low- and high-yielding groups and to compare mean values of nutrient ratios selected as the dris norms of low- and high-yielding groups. leaf samples (analyzed for n, p, k, ca, mg, s, cu, mn and zn contents) and respective yields were collected in 126 commercial sugarcane fields in rio de janeiro state, brazil and used to establish dris norms for sugarcane. nearly all nutrient ratios selected as dris norms (77.8%) showed statistical differences between mean values of the low- and high-yielding groups. these different nutritional balances between the low- and high-yielding groups indicate that the dris norms developed in this paper are reliable. the dris norms for micronutrients with high s2l /s2h ratio and low coefficient of variation found can provide more security to evaluate the micronutrient status of sugarcane.
DRIS norms validation for sugarcane crop
Reis Junior, Roberto dos Anjos;Monnerat, Pedro Henrique;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000300007
Abstract: the objectives of this study were to evaluate the relationship between the diagnosis and recommendation integrated system (dris) indices and foliar nutrient concentrations, to establish optimum foliar nutrient concentrations with dris and to validate the dris norms for sugarcane crop. foliar nutrient concentrations from 126 sugarcane commercial fields were analyzed during the 1996/97 season, to calculate dris indices. regression analysis was used to fit a model relating dris indices to nutrient concentrations. experiments were carried out during the 1997/98 season, whose treatments consisted of the addition of the most limiting nutrients according to dris. a new diagnosis was performed. at the end of 1997/98 season, the yields of each plot were collected. analysis of variance and duncan test (5%) were used for the evaluation of the collected data. there was a positive and significant relationship between sugarcane foliar nutrient concentrations and dris indices. the optimum foliar nutrient concentrations for sugarcane are: 13.4 g ha-1 for n, 1.91 g ha-1 for p, 12.2 g ha-1 for k, 2.99 g ha-1 for ca, 2.15 g ha-1 for mg, 1.61 g ha-1 for s, 4.48 mg ha-1 for cu, 67.8 mg ha-1 for mn and 11.7 mg ha-1 for zn. dris norms evaluated are useful to correct nutritional imbalances and to increase sugarcane yield.
Nutrient concentrations in potato stem, petiole and leaflet in response to potassium fertilizer
Reis Jr., Roberto dos Anjos;Monnerat, Pedro Henrique;
Scientia Agricola , 2000, DOI: 10.1590/S0103-90162000000200009
Abstract: chemical composition of potato stem, petiole and leaflet were evaluated in response to the application of k fertilizer. potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of k2o), as k2so4 and was placed in the furrow during planting. two plants per plot were sampled 48 days after plant emergence to evaluate n, p, k, ca, mg, s, cu, mn and zn concentrations in stems, petioles and leaflets of the youngest fully expanded leaf. it is recommended using potato petioles to evaluate the n, p, k, ca, mg and cu status and using potato leaflet to evaluate the s, mn and zn status. the stem was not a good indicator of s nutritional status. petiole n, p and cu concentrations associated with the maximum tuber yield (30.5 t ha-1, with 353.4 kg ha-1 of k2o) were 25.9 g kg-1, 1.4 g kg-1 and 9.7 mg kg-1, respectively, while, the leaflet s, mn and zn concentrations associated with the maximum tuber yield were 4.0 g kg-1, 155.2 mg kg-1 and 59.4 mg kg-1, respectively. this information should be used to build data banks of adequate nutrient concentration at different portions of potato plant and like this, to aid the nutrient diagnosis in potato crops.
EFEITO DE DIFERENTES FOTOPERíODOS NO CRESCIMENTO DE DOIS CULTIVARES DE ALHO (Allium sativum L.) EFFECT OF DIFFERENT PHOTOPERIODS IN THE GROWTH OF TWO GARLIC (Allium sativum L.) CULTIVARS
Carluce Gomes de Sá e Carvalho,Pedro Henrique Monnerat
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v8i1.2301
Abstract: Este experimento foi realizado em condi es de casa-de-vegeta o, com dois cultivares de alho, Amarante e Centenário, com o objetivo de verificar o efeito de fotoperíodos de 9, 12, 15 horas e natural, sobre o crescimento dessa hortali a. As plantas submetidas a fotoperíodos de 12 e 15 horas, receberam 9 horas de luz natural e complementa o com luz incandescente, com intensidade luminosa de 180 lux, aproximadamente. Observou-se que quanto mais longo o fotoperíodo, menores o peso seco total, peso seco da parte aérea, peso seco da bainha, pese seco das plantas, peso seco das raízes, número total de folhas e área foliar, em ambos os cultivares. No cultivar Amarante as taxas máximas de crescimento ocorreram tanto mais cedo quanto mais longo o fotoperíodo. Em ambos os cultivares, a varia o do fotoperíodo afetou muito mais o crescimento dos bulbos que o da parte aérea, verificando-se que fotoperíodos longos apressaram a queda da raz o bulbar, sendo que quanto mais longo o fotoperíodo, mais rápido ocorreu o desenvolvimento dos bulbilhos. Plantas do cultivar Centenário sob fotoperíodos de 9 horas, apresentaram elevada incidência de podrid o dos bulbos. This experiment was made with two varieties of garlic, the Amarante and Centenario, under greenhouse conditions, to verify the effect of photoperiods of 9, 12 and 15 hours and natural sunlight on the growth of this vegetable. Plants exposed to photoperiods of 12 and 15 hours received 9 hours of natural light and incandescent light at aproximately 180 lux for the remaining hours. Results showed that the longer the photoperiod the lower the following dry weights in both types of garlic: the total, the exposed parts, sheathes, leaves and roots, and the longer the photoperiod, the lower the total number of leaves and leaf surfaces in the two types of garlic. In the Amarante variety, the highest rates of growth occurred earlier when the photoperiod was longer. In both varieties of garlic, the variations in photoperiods affected the growth of the bulb much more than they did the exposed parts showing that long photoperiods hastened the decrease of the bulbar ratio, and that the longer the photoperiod, the faster the development of the cloves. Plants of the Centenario variety which wore exposed to a photoperiod of 9 hours, showed a high rate of bulb rotting.
DRIS norms validation for sugarcane crop
Reis Junior Roberto dos Anjos,Monnerat Pedro Henrique
Pesquisa Agropecuária Brasileira , 2003,
Abstract: The objectives of this study were to evaluate the relationship between the diagnosis and recommendation integrated system (DRIS) indices and foliar nutrient concentrations, to establish optimum foliar nutrient concentrations with DRIS and to validate the DRIS norms for sugarcane crop. Foliar nutrient concentrations from 126 sugarcane commercial fields were analyzed during the 1996/97 season, to calculate DRIS indices. Regression analysis was used to fit a model relating DRIS indices to nutrient concentrations. Experiments were carried out during the 1997/98 season, whose treatments consisted of the addition of the most limiting nutrients according to DRIS. A new diagnosis was performed. At the end of 1997/98 season, the yields of each plot were collected. Analysis of variance and Duncan test (5%) were used for the evaluation of the collected data. There was a positive and significant relationship between sugarcane foliar nutrient concentrations and DRIS indices. The optimum foliar nutrient concentrations for sugarcane are: 13.4 g ha-1 for N, 1.91 g ha-1 for P, 12.2 g ha-1 for K, 2.99 g ha-1 for Ca, 2.15 g ha-1 for Mg, 1.61 g ha-1 for S, 4.48 mg ha-1 for Cu, 67.8 mg ha-1 for Mnand 11.7 mg ha-1 for Zn. DRIS norms evaluated are useful to correct nutritional imbalances and to increase sugarcane yield.
Norms establishment of the Diagnosis and Recommendation Integrated System (DRIS) for nutritional diagnosis of sugarcane
Reis Junior Roberto dos Anjos,Monnerat Pedro Henrique
Pesquisa Agropecuária Brasileira , 2003,
Abstract: The objectives of this study were to establish DRIS norms for sugarcane crop, to compare mean yield, foliar nutrient contents and variance of nutrient ratios of low- and high-yielding groups and to compare mean values of nutrient ratios selected as the DRIS norms of low- and high-yielding groups. Leaf samples (analyzed for N, P, K, Ca, Mg, S, Cu, Mn and Zn contents) and respective yields were collected in 126 commercial sugarcane fields in Rio de Janeiro State, Brazil and used to establish DRIS norms for sugarcane. Nearly all nutrient ratios selected as DRIS norms (77.8%) showed statistical differences between mean values of the low- and high-yielding groups. These different nutritional balances between the low- and high-yielding groups indicate that the DRIS norms developed in this paper are reliable. The DRIS norms for micronutrients with high S2l /S2h ratio and low coefficient of variation found can provide more security to evaluate the micronutrient status of sugarcane.
EFEITO DE DIFERENTES FOTOPERíODOS NA BULBIFICA O DE DOIS CULTIVARES DE ALHO (Allium sativum L.) EFFECT OF DIFFERENT PHOTOPERIODS IN THE BULBING OF TWO GARLIC (Allium sativum L.) CULTIVARS
Carluce Gomes de Sá e Carvalho,Pedro Henrique Monnerat
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v6i1.2241
Abstract: Este experimento foi realizado com duas variedades de alho, Amarante e Centenário, em condi es de casa-de-vegeta o com o objetivo de verificar o efeito de fotoperíodos de 9, 12, 15 horas e natural, sobre a bulbifica o dessa hortali a. Plantas submetidas a fotoperíodos de 12 e 15 horas receberam 9 horas de luz natural e complementa o com luz incandescente, com intensidade luminosa de 180 lux, aproximadamente. Observou-se que fotoperíodos mais longos antecipam o início de bulbifica o, reduzindo o ciclo da cultura, em ambos os cultivares. O aumento do comprimento do dia promoveu decréscimo no peso dos bulbos na ocasi o da colheita como resultado da redu o do estágio de crescimento dos bulbos. A ocorrência de bulbifica o em todos os tratamentos indica que o fotoperíodo crítico é inferior a 9 horas, em ambos os cultivares. This experiment was carried out with two garlic varieties, Amarante and Centenário, under greenhouse conditions in order to verify the effect of the photoperiod of 9, 12, 15 hours, and natural, on the bulbing of that vegetable. Plants exposed to photoperiod of 12 and 15 hours, received 9 hours of sunlight followed by incandescent light (180 lux, aproximately). Results show that long-day treatments hasten the bulb formation with reduction of the culture cycle, in both varieties. The increase of day-length caused decrease of bulb weight at the time of harvesting, as result of the shortening of the bulb’s growth stage. The occurrence of bulbing in all treatments indicated that the critical photoperiod is lower than 9 hours, in both varieties.
Nutrient concentrations in potato stem, petiole and leaflet in response to potassium fertilizer
Reis Jr. Roberto dos Anjos,Monnerat Pedro Henrique
Scientia Agricola , 2000,
Abstract: Chemical composition of potato stem, petiole and leaflet were evaluated in response to the application of K fertilizer. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4 and was placed in the furrow during planting. Two plants per plot were sampled 48 days after plant emergence to evaluate N, P, K, Ca, Mg, S, Cu, Mn and Zn concentrations in stems, petioles and leaflets of the youngest fully expanded leaf. It is recommended using potato petioles to evaluate the N, P, K, Ca, Mg and Cu status and using potato leaflet to evaluate the S, Mn and Zn status. The stem was not a good indicator of S nutritional status. Petiole N, P and Cu concentrations associated with the maximum tuber yield (30.5 t ha-1, with 353.4 kg ha-1 of K2O) were 25.9 g kg-1, 1.4 g kg-1 and 9.7 mg kg-1, respectively, while, the leaflet S, Mn and Zn concentrations associated with the maximum tuber yield were 4.0 g kg-1, 155.2 mg kg-1 and 59.4 mg kg-1, respectively. This information should be used to build data banks of adequate nutrient concentration at different portions of potato plant and like this, to aid the nutrient diagnosis in potato crops.
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