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Search Results: 1 - 10 of 151750 matches for " BüLL LEONARDO THEODORO "
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TERMOFOSFATOS: ALTERA??ES EM PROPRIEDADES QUíMICAS EM UM LATOSSOLO VERMELHO-ESCURO E EFICIêNCIA AGRON?MICA
BüLL, LEONARDO THEODORO;LACERDA, SUMAYA;NAKAGAWA, JúLIO;
Bragantia , 1997, DOI: 10.1590/S0006-87051997000100018
Abstract: effects of thermal phosphates on a dark red latosol chemical properties and their agronomic efficiencies were evaluated in a pot experiment with three consecutive lettuce crops, at the soil science department/fca-unesp, botucatu, state of s?o paulo, brazil. treatments, along with a control check (without fertilizer), consisted of applications to soils of 200 mg p/dm3 as superphosphate, fine and coarse thermophosphate (with micronutrients) and thermophosphate-mg. soil samples were collected, for chemical anaylisis, from all pots before each lettuce transplanting and after last harvest. p, ca and mg soil availabilities after coarse thermophosphate dressing were overestimated by the ion exchange resin methodology. coarse thermophosphate was not effective in reducing soil acidity, while fine thermophosphate increased soil ph value. due to lower solubility, coarse thermophosphate applications resulted in lower lettuce yields and fertilizer efficiencies than those of fine thermophosphate.
Efeito do nitrogênio e do lodo de esgoto nos fatores produtivos do feijoeiro
Lobo, Thomaz Figueiredo;Filho, Helio Grassi;Büll, Leonardo Theodoro;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000100017
Abstract: the final disposal of sewage sludge has become one of the most important urban environmental problems. the volume of this waste is growing daily in both developed and developing countries, reflecting the expansion of collection networks and increased levels of treatment. the objective of this study was to investigate the effect of sewage sludge and n chemical fertilizers on bean yield components. composted sewage sludge was applied in december 2007 on common bean grown in no-tillage system. the experiment was arranged in a randomized block design, consisting of 6 treatments and 4 replicates defined as follows: t0 - no nitrogen fertilization; t1 - mineral nitrogen fertilizer according to the recommendations for the crop; t2 - 50% nitrogen fertilizer from sewage sludge and 50% in the mineral form; t3 100% nitrogen derived from sewage sludge; t4 - 150% nitrogen derived from sewage sludge; t5 - 200% nitrogen derived from sewage sludge. increasing the dose of sewage sludge promoted an increase in the number of pods, dry matter yield, grain yield and 1000 grain mass.
TERMOFOSFATOS: ALTERA ES EM PROPRIEDADES QUíMICAS EM UM LATOSSOLO VERMELHO-ESCURO E EFICIêNCIA AGRON MICA
BüLL LEONARDO THEODORO,LACERDA SUMAYA,NAKAGAWA JúLIO
Bragantia , 1997,
Abstract: Visando avaliar as altera es químicas decorrentes da aplica o de termofosfatos em solo típico da regi o dos cerrados e a eficiência agron mica desses fertilizantes, realizou-se o presente trabalho, no período de novembro de 1993 a fevereiro de 1994, em casa de vegeta o telada, do Departamento de Ciência do Solo da Faculdade de Ciências Agron micas/UNESP, em Botucatu (SP). Utilizaram-se vasos ceramicos contendo 5 L de terra da camada arável de um latossolo vermelho-escuro álico, textura média, em três cultivos sucessivos de plantas de alface. Os tratamentos, além de um controle sem fósforo, foram constituídos por aplica es ao solo de 200 mg/dm3 de P na forma de superfosfato triplo (ST), termofosfato "Yoorin Master" em pó (TMpó) e granular (TMgr) e termofosfato "MG-Yoorin" em pó (T). As disponibilidades de fósforo, cálcio e magnésio no solo com termofosfato granular foram superestimadas pela extra o com resina trocadora apresentando valores superiores às demais fontes, n o compatíveis com as concentra es desses nutrientes no tecido foliar. O termofosfato magnesiano (T) proporcionou o maior acúmulo de fósforo na parte aérea das plantas. A capacidade de neutraliza o da acidez do solo dos termofosfatos em pó foi superior ao da forma granular. As diferen as no tamanho de partículas, alterando sensivelmente a solubilidade do termofosfato granular, proporcionaram produ es de biomassa e índice de eficiência agron mica dessa fonte infe-riores àqueles obtidos com os termofosfatos em pó.
Produ??o de bulbos e incidência de pseudoperfilhamento na cultura do alho vernalizado em fun??o de aduba??es potássicas e nitrogenadas
Büll, Leonardo Theodoro;Bertani, Rosemary Marques de Almeida;Villas B?as, Roberto Lyra;Fernandes, Dirceu Maximino;
Bragantia , 2002, DOI: 10.1590/S0006-87052002000300006
Abstract: two experiments were carried out under greenhouse conditions, with the objective of studying the influence of n x k interaction on vernalizated garlic (allium sativum l.) grown in 50 kg pots. both experiments were in factorial 4 x 4: (a) one in 1993 with four potassium levels in the sowing (original, 4%, 8% and 16% of cec) and four levels of nitrogen in covering (40, 80, 160 and 320 kg.ha-1) applied half at 30 and the remaining at 50 days after seed emergency (dae); (b) the other in 1994, with four potassium levels and four nitrogen levels, both splitted and applied in covering. at 70 dae two plants per pot were collected for nutritional diagnosis. the results indicated that the leaf concentration of nitrogen was slightly reduced by k fertilization applied in the sowing or in covering. however, there were increases in the potassium concentration with the nitrogen concentration in the leaves; the chlorophyll concentration increased with the potassium levels in the leaves, because of variations in k fertilizer rates applied in the sowing, and with the nitrogen rates in covering; increases in n fertilizer rates in covering enhanced the pseudogrowing incidence in the culture, that was not affected by k fertilization in the sowing or in covering; the bulb yield was slightly increased by nitrogen fertilization in covering.
Fertiliza??o potássica na cultura do alho vernalizado
Büll, Leonardo Theodoro;Villas B?as, Roberto Lyra;Fernandes, Dirceu Maximino;Bertani, Rosemary Marques Almeida;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000100024
Abstract: the objective of this study was to evaluate the effects of spliting potassic fertilization on pseudobudding and bulb yield of vernalized garlic (allium sativum l.) grown in 55 l pots under greenhouse conditions, and also to estimate the best application time. in a first experiment half of the necessary potassium rate for the crop was applied at 50, 60, 70, 81, 91, 101 and 111 days after the emergence (dae), and in a second experiment consisted of four potassium rates at sowing, combined with other four at 81 dae. the spliting of the potassic fertilization at different development stadia did not affect the bulb yield and pseudobudding. the contents of k, ca and mg in the leaves were influenced by the potassium applied at sowing and at 81 dae; an antagonistic effect being observed in relation to potassium and contents of ca and mg in the leaves. the increase of soil potassium level at the sowing stage lead to increase of bulb yield, and this was not influenced by potassium rates applied at 81 dae.
Fertiliza o potássica na cultura do alho vernalizado
Büll Leonardo Theodoro,Villas B?as Roberto Lyra,Fernandes Dirceu Maximino,Bertani Rosemary Marques Almeida
Scientia Agricola , 2001,
Abstract: O objetivo do presente trabalho foi verificar a validade do parcelamento da aduba o potássica, bem como a época mais adequada de aplica o, no controle do superbrotamento e no desenvolvimento e produ o de bulbos na cultura do alho vernalizado (cv. Roxo Pérola de Ca ador). Foram instalados dois experimentos em estufa agrícola, em vasos de cimento amianto com capacidade para 55 L de terra. O experimento 1 consistiu de sete épocas de aplica o da metade da dose de potássio necessária para a cultura, aos 50, 60, 70, 81, 91, 101 e 111 dias após a emergência (dae), sendo que o experimento 2 consistiu da aplica o de quatro doses de potássio no plantio combinadas a outras quatro em cobertura, aos 81 dae. O parcelamento da aduba o potássica em diferentes estádios de desenvolvimento n o influenciou a produ o de bulbos e o superbrotamento na cultura do alho. A absor o de potássio, cálcio e magnésio pelas plantas foi influenciada pela aduba o potássica no plantio e em cobertura, observando-se um efeito antag nico do potássio sobre a absor o de cálcio e magnésio. A eleva o no nível de potássio no solo por ocasi o do plantio proporcionou aumento na produ o de bulbos, sendo que esta n o foi influenciada por varia es na dose de aduba o potássica em cobertura.
Produ o de bulbos e incidência de pseudoperfilhamento na cultura do alho vernalizado em fun o de aduba es potássicas e nitrogenadas
Büll Leonardo Theodoro,Bertani Rosemary Marques de Almeida,Villas B?as Roberto Lyra,Fernandes Dirceu Maximino
Bragantia , 2002,
Abstract: Com o objetivo de estudar a influência da intera o N x K na cultura do alho (Allium sativum L.) vernalizado, instalaram-se dois experimentos em casa de vegeta o telada, em vasos retangulares de cimento-amianto contendo 50 kg de terra da camada arável em Latossolo Vermelho-Escuro álico, textura média. Ambos os experimentos constituíram fatorial 4 x 4. Em 1993, estudaram-se quatro níveis de potássio no plantio (original, 4%, 8% e 16% da CTC) e quatro níveis de nitrogênio em cobertura (40, 80, 160 e 320 kg.ha-1) aplicados em duas parcelas, metade aos 30 dias e metade aos 50 dias após a emergência (DAE). O experimento de 1994 compreendeu quatro níveis de potássio e os mesmos quatro níveis de nitrogênio, ambos aplicados parcelados em cobertura, mantendo-se constante o nível de potássio aplicado no plantio. Aos 70 DAE coletaram-se duas plantas de cada vaso para diagnose foliar. Os resultados indicaram redu o na concentra o foliar de nitrogênio pela aduba o potássica, tanto no plantio quanto na cobertura, havendo, entretanto, aumento nos teores de potássio com a concentra o de nitrogênio no tecido; aumento na concentra o de clorofila com os níveis de potássio no tecido foliar, em virtude de varia es nas doses de fertilizante potássico aplicado no plantio e com as doses de nitrogênio em cobertura; favorecimento das eleva es nas doses da aduba o nitrogenada em cobertura na incidência de pseudoperfilhamento na cultura, que n o foi influenciada pela aduba o potássica no plantio ou em cobertura; aumento na produ o de bulbos com aduba o nitrogenada em cobertura.
Doses de fósforo e zinco na cultura do alho em condi??es de casa de vegeta??o
Büll, Leonardo Theodoro;Novello, Aline;Corrêa, Juliano Corulli;Villas Boas, Roberto Lyra;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000400017
Abstract: phosphate fertilization increases garlic yield, but high doses of phosphorus (p) may cause zinc deficiency (zn) in plants, mainly when the soil presents low contents of this micronutrient. this paper aimed to verify the effect of p and zn interaction in the soil on the development and yield of garlic bulbs ("roxo pérola de ca?ador" cultivar). three experiments were carried out under screened greenhouse conditions, using three soils of different texture and 17 kg pots. they had a randomized factorial block design, 4 doses of p (0, 100, 200 and 400 mg dm-3 ), 4 doses of zn (0, 2,5, 5,0 and 10 mg dm-3), both applied as znso4.7h2o, and three replications. garlic bulb development and yield were influenced by doses of p and zn; there was no interaction between these nutrients. for sand, loamy and clayey soils, the best doses of p were 190, 400 and 400 mg dm-3 whereas for zn, they were 2.2, 6.5 and 5.1 mg dm-3, respectively.
Atributos químicos do solo, crescimento radicular e produtividade do arroz de acordo com a aplica??o de escórias
Carvalho-Pupatto, Juliana Garcia;Büll, Leonardo Theodoro;Crusciol, Carlos Alexandre Costa;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004001200008
Abstract: use of industrial residues as alternative sources of nutrients to the plants is due to the necessity of reducing their accumulation in the production sites. the objective of this work was to evaluate the effect of metallurgy slag in soil chemical attributes, in development and in grain yield of upland rice sprinkler irrigated. the experiment was carried out in a randomized block design, with three treatments constituted by two scums, blast furnace (196 g kg-1 of si) and steel slag (56 g kg-1 of si), and a control without application, with eight replications. the scums can be used as corrective of soil acidity and silicon source. alterations in the soil chemical attributes are related to the chemical composition of the scums. blast furnace slag resulted in higher root growth in depth and better distribution in the profile soil provides higher shoot dry matter yield and grain yield.
Aplica??o superficial de escória, lama cal, lodos de esgoto e calcário na cultura da soja
Corrêa, Juliano Corulli;Büll, Leonardo Theodoro;Crusciol, Carlos Alexandre Costa;Tecchio, Marco Antonio;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000900016
Abstract: the objective of this work was to evaluate the effect of the surface application of sewage sludge, aqueous lime, flue dust and limestone on soybean nutrition and yield in notill system. the experiment was arranged in a randomized complete block design, in factorial scheme of 4x4+1, and consisted of four residues: centrifuged sewage sludge (css), biodigestor sewage sludge (bss), flue dust (fd) and aqueous lime (al), at 0, 2, 4 and 8 mg ha-1, and one additional control treatment with dolomitic limestone at 2 mg ha-1. the soybean plants showed greater contents of nitrogen, phosphorus and calcium in 2003, 2004 and 2005, and potassium contents in 2003 and 2004, due to the treatments css, bss, fd, al and limestone. soybean grain yield was also enhanced due to surface applications of the treatments in notill system in 2003, 2004 and 2005. the phosphorus and calcium contributed to increase soybean yield in 2003 and 2004.
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