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Search Results: 1 - 10 of 8294 matches for " LEONARDO THEODORO;LACERDA "
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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.
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.
Ecological and phytochemical characterization of four natural populations of Maytenus ilicifolia at Parana State, Brazil Caracteriza o ecológica e fitoquímica de quatro popula es naturais de Maytenus ilicifolia no Estado do Paraná
Maria Izabel Radomski,Leonardo Theodoro Bull
Pesquisa Florestal Brasileira , 2010, DOI: 10.4336/2012.pfb.61.01
Abstract: Maytenus ilicifolia (Mart. ex Reiss.) is a medicinal species that occurs naturally on different soils and light conditions. This involves adaptation mechanisms of the natural populations whose chemical characteristics may be genetically determined. This study was developed to determine the influence of the environment in the phytochemical content of M. ilicifolia. The plant samples were collected from four natural communities on distinct geological regions at Parana State and under different light conditions (full sun middle shade and shade). The soils were classified according to the Brazilian Classification System. The specific leaf mass was determined as well the total content of N, P, K, Ca, Mg, Fe, Mn, Cu, Zn, Si, Al, lignin, total phenols and tannins. This study indicates that M. ilicifolia occurs in an indistinct fertility and hydrological gradient of soils. Also, it was found out that the content of lignin and tannin of M. ilicifolia can be controlled by the light availability. doi: 10.4336/2010.pfb.30.61.01 A espécie medicinal Maytenus ilicifolia (Mart. ex Reiss.) localiza-se naturalmente sob diferentes condi es edafoclimáticas. Isto implica em prováveis mecanismos de adapta o das popula es naturais, cujas características químicas podem estar fixadas geneticamente. Este estudo foi desenvolvido para determinar a influência do ambiente sobre a composi o fitoquímica de M. ilicifolia. Amostras de plantas foram coletadas em quatro popula es naturais localizadas sobre diferentes superfícies geológicas no Estado do Paraná e sob distintas condi es de luminosidade (pleno sol, meia sombra e sombra). Os solos foram classificados segundo o Sistema Brasileiro de Classifica o. Foram avaliados os teores foliares de N, P, K, Ca, Mg, Fe, Mn, Cu, Zn, Si, Al, lignina, fenóis totais, fenóis n o tanantes e taninos, e a massa específica foliar. Os resultados indicam que M. ilicifolia apresenta plasticidade ambiental, ocorrendo em distintas condi es de fertilidade e regime hidromórfico dos solos. Também foi observado que é possível controlar a síntese de lignina e taninos em M. ilicifolia por meio da disponibilidade de luz. doi: 10.4336/2010.pfb.30.61.01
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.
Inference for Interest Rate Models Using Milstein’s Approximation  [PDF]
Theodoro Koulis, Aera Thavaneswaran
Journal of Mathematical Finance (JMF) , 2013, DOI: 10.4236/jmf.2013.31010
Abstract:

A class of martingale estimating functions based on the first two moments of the observed process provides a convenient framework for estimating the parameters of diffusion processes [1]. In the Bayesian set up, combined estimating functions had been studied for diffusion processes in [2] with filtering applications. However, when the conditional mean and the conditional variance are functions of parameters of interest in a diffusion process model, the basic martingales generating components of quadratic estimating functions are such that one is an absolute continuous function with respect to the other [3, p. 94]. Hence, the combined martingale estimating functions cannot be constructed for continuous-time diffusion processes. In this paper, a general framework for parameter estimation of discretely observed interest rate models is developed by using the Milstein approximation and closed form expressions for the information gain are also obtained. The method is used to study the estimates of the parameters for an extended version of the CoxIngersoll-Ross interest rate model.

 

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.
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.
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.
Corre??o da acidez e mobilidade de íons em Latossolo com aplica??o superficial de escória, lama cal, lodos de esgoto e calcário
Corrêa, Juliano Corulli;Büll, Leonardo Theodoro;Crusciol, Carlos Alexandre Costa;Marcelino, Rafael;Mauad, Munir;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000900013
Abstract: the experiment was carried out under field conditions in a no-tillage system from 2002 to 2005, aiming to evaluate liming, base saturation and nitrate, calcium and magnesium mobility in a dystrophic clay rhodic hapludox soil. the possible interference of organic acid catering of black oat through surface application of flue dust, aqueous lime and sewage sludge from a centrifuge and a biodigestor were also evaluated at rates of zero (control), 2, 4 and 8 t ha-1 as well as an additional treatment of dolomitic limestone at the rate of 2 t ha-1. due to the increasing surface applications of flue dust, aqueous lime and sewage sludge from a centrifuge, soil ph value increased; these three residues and the sewage sludge from a biodigestor increased base saturation and availability of nitrate, calcium and magnesium up to the depth of 40 cm and within three months only. the low concentration of organic acid in the aerial part of the black oat did not explain the quicky nutrient leaching and soil acidity neutralization in depth. flue dust, aqueous lime and sewage sludge from a centrifuge can be used as an acidity corrective and applied on the soil surface in no-tillage system.
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