oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2020 ( 1 )

2019 ( 82 )

2018 ( 162 )

Custom range...

Search Results: 1 - 10 of 54289 matches for " Edson Cabral da; "
All listed articles are free for downloading (OA Articles)
Page 1 /54289
Display every page Item
Productivity and Dry Matter Accumulation of Sugarcane Crop under Irrigation and Nitrogen Application at Rio Verde GO, Brazil  [PDF]
Alefe Viana Souza Bastos, Renato Campos de Oliveira, Nelmício Furtado da Silva, Marconi Batista Teixeira, Frederico Antonio Loureiro Soares, Edson Cabral da Silva
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614240
Abstract: Dry matter production and productivity of stem currently are being widely studied in sugarcane, reinforcing the study in question, which aims to assess the accumulation of dry matter of the aerial segment and the productivity of stems of sugarcane crops within the first cycle, at different levels of water replacement (WR) with and without nitrogen fertilization, through a subsurface drip irrigation system. The assay was conducted in the experimental area of the Federal Institut Goiano, Campus Rio Verde, GO, Brazil, in a dystroferric Rhodic Hapludox soil, cerrado phase (savannah), and comprised experimental splits of three furrows with an 8-meter long double row. Experimental design consisted of randomized blocks in a 5 × 2 factorial array, with four replications. Evaluated factors comprised five levels of WR (100%, 75%, 50%, 25% and 0% of field capacity), with and without the application of nitrogen (0 and 100 kg·ha-1 urea). Harvest occurred in May 2013 and stem productivity (SP), productivity of pointers (PP), productivity of straw (PS), harvest index (HI), dry matter of stem (DMS), dry matter of pointers (DMP), the relationship between dry matter of pointer and dry matter of stem (DMP/DMS) and total dry matter of the aerial segment (TDM) were determined. The variables SP, PP, DMS and DMP had a linear growth in proportion to WR increase, whereas HI and DMP/DMS adjusted to a quadratic model. Nitrogen fertilization affected positively the variables SP, HI, DMS and DMP/DMS and occurred interaction to TDM; also increasing the productivity stem and the harvest index.
Aproveitamento do nitrogênio (15N) da crotalária e do milheto pelo milho sob plantio direto em Latossolo Vermelho de Cerrado
Silva Edson Cabral da,Muraoka Takashi,Buzetti Salatiér,Veloso Marcos Emanuel da Costa
Ciência Rural , 2006,
Abstract: O cultivo de adubos verdes na entressafra altera a dinamica e a recupera o do nitrogênio pelo milho no sistema solo-planta. O objetivo deste trabalho foi avaliar a eficiência de utiliza o do N da crotalária (Crotalaria juncea) e do milheto (Pennisetum americanum), marcados com 15N, pelo milho cultivado sob diferentes doses de N em plantio direto, num Latossolo Vermelho de Cerrado. O estudo foi desenvolvido na fazenda experimental da Faculdade de Engenharia de Ilha Solteira-UNESP, Selvíria-MS, nos anos agrícolas 2001/02 e 2002/03. O delineamento experimental foi o de blocos casualizados, com 15 tratamentos e quatro repeti es, dispostos em esquema fatorial 5 x 3, constituídos pela combina o de cinco doses de N (0, 30, 80, 130 e 180kg ha-1), na forma de uréia, aplicadas no estádio quatro folhas, e três sistemas de cobertura do solo: crotalária, milheto e o solo em pousio entressafra. O N inorganico promoveu um efeito sinérgico na quantidade de N absorvida e no aproveitamento pelo milho do N da crotalária e do milheto. A crotalária, na média dos dois anos agrícolas, proporcionou, no milho cultivado sem a aplica o de N, um efeito equivalente à aplica o de 56,0 e 73,0kg ha-1 de N-uréia, comparado ao do milho cultivado sobre solo em pousio e em sucess o ao milheto, respectivamente. A produtividade de gr os aumentou de forma quadrática em fun o das doses de N, nos dois anos agrícolas.
Doses e épocas de aplica??o de nitrogênio na cultura do milho em plantio direto sobre Latossolo Vermelho
Silva, Edson Cabral da;Buzetti, Salatier;Guimar?es, Giovani Lima;Lazarini, Edson;Sá, Marco Eustáquio de;
Revista Brasileira de Ciência do Solo , 2005, DOI: 10.1590/S0100-06832005000300005
Abstract: nitrogen (n) is the nutrient taken up in the largest quantity by corn and it has the greatest effect on grain yield. its dynamics in the soil-plant system is influenced by the management. the aim of this study was to evaluate nitrogen rates and application times in corn in a recently implanted no-tillage system. this study was conducted at the experimental station of unesp/feis - ilha solteira campus in selvíria, state of mato grosso do sul, brazil, during the growth season of 1998/99 and 1999/00 on a clayey dystrophic dark red latosol (rhodic haplustox). the experimental design was structured in randomized complete blocks, with 19 treatments and 4 replications in an incomplete factorial 6 x 3 + 1 (control: 0 kg ha-1) scheme. six combinations of n application timing (total dose at sowing, total dose at the 4 - 6 leaf stage, total dose at the 8 - 10 leaf stage, ? at sowing + ? at the 4 to 6 leaf stage, ? at sowing + ? at 8 to 10 leaf stage and, ? at the 4 to 6 leaf stage + ? at the 8 to 10 leaf stage) and 4 rates of n-urea (0, 60, 120, and 180 kg ha-1). soil samples were collected in the 0.0-0.10, 0.10-0.20 and 0.20-0.40 m layers for an evaluation of n-nh4+, n- no3-, mineral-n and total-n concentration. plants were analyzed for plant and ear height, leaf n concentration at flowering and n concentration in the grains, rows of grain per ear, grains per row, weight of thousand grains, and grain yield. the nh4+ content was higher than no3- at the same depths, in both cultivations. the grain yield of the corn had the highest technical efficiency at the n rate of 166 kg ha-1, and a maximum economical efficiency with 126 kg ha-1 of n, applied half dose at sowing and the remaining at the 4-6 leaf stage, considering a fertilizer cost and corn price ratio of 8.25:1.
Contribui??o da fixa??o biológica de nitrogênio, fertilizante nitrogenado e nitrogênio do solo no desenvolvimento de feij?o e caupi
Brito, Marciano de Medeiros Pereira;Muraoka, Takashi;Silva, Edson Cabral da;
Bragantia , 2011, DOI: 10.1590/S0006-87052011000100027
Abstract: biological nitrogen fixation (bnf) constitutes a valuable source of this nutrient for the common bean phaseolus vulgaris l. and cowpea vigna unguiculata (l.) walp., being its avaibility affected by mineral n in the soil solution. the objectives of this work were to evaluate the effects of nitrogen rate, as urea, on symbiotic fixation of n2 in common bean and cowpea plants, using the isotopic technique, and quantifying the relative contributions of n sources symbiotic n2 fixation, soil native nitrogen and urea n on the growth of the common bean and cowpea. non nodulating soybean plants were used as standard. the research was carried out in greenhouse, using pots with 5 kg of soil from a typic haplustox (dystrophic red yellow latosol). the experimental design was completely randomized blocks, with 30 treatments and three replications, arranged in 5x3x2 factorial outline. the treatments consisted of five n rates: 2, 15, 30, 45 and 60 mg n kg-1 soil; three sampling times: 23, 40 and 76 days after sowing (das) and two crops: common bean and cowpea. the bnf decreased with increase n rates, varying from 81.5% to 55.6% for cowpea, and from 71.9% to 55.1% for common bean. the symbiotic n2 fixation in cowpea can substitute totally the nitrogen fertilization. the nitrogen absorption from soil is not affected by nitrogen fertilizer rate. the n recovery from fertilizer at 76 das was of 60.7% by common bean, and 57.1% by cowpea. the symbiotic association in common bean needs the application of a starting dose (40 kg n ha-1) for economically acceptable yields.
Manejo de nitrogênio no milho sob plantio direto com diferentes plantas de cobertura, em Latossolo Vermelho
Silva, Edson Cabral da;Muraoka, Takashi;Buzetti, Salatiér;Trivelin, Paulo César Ocheuze;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000300015
Abstract: the objective of this work was to evaluate the best rate and time for n application, and n utilization using urea-15n, by corn crop grown under no-tillage system, in succession to sun hemp (crotalaria juncea l.), millet (pennisetum americanum) and to the spontaneous vegetation (fallow ground), in a rhodic hapludox soil in cerrrado. the experimental design was randomized complete blocks, with 24 treatments and four replications, in an incomplete factorial 3x3x2 + 6: three n rates (80, 130 and 180 kg ha-1 n); three preceding cover crops (sun hemp, millet and fallow ground); two n application time (four leaves or eight leaves stage); and six additional treatments (three without n application and three that received 30 kg ha-1 n at seeding). the corn grown in succession to sun hemp provided higher amount of n derived from fertilizer, n utilization efficiency and grain yield. application of n to corn four leaves stage provides higher grain yield, compared to the application to eight leaves stage, in succession to millet.
Aproveitamento de nitrogênio pelo milho, em raz?o da aduba??o verde, nitrogenada e fosfatada
Silva, Edson Cabral da;Muraoka, Takashi;Villanueva, Felipe Carlos Alvarez;Espinal, Freddy Sinencio Contreras;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009000200002
Abstract: the objectives of this work were to evaluate corn (zea mays) nitrogen (n) utilization from the green manure crops sunnhemp (crotalaria juncea) and millet (pennisetum glaucum l.) and from urea, and to calculate the contribution of soil n to the mineral nutrition of corn, as affected by nitrogen and phosphorus mineral fertilizers. the experiment was conducted in a greenhouse, in pots with 5 kg of soil (rhodic hapludox). the experimental design was completely randomized, with 32treatments and four replicates, in a 4x4x2 factorial array. the treatments were combinations of four n rates as urea: 0, 0.75, 1.50 and 2.25g n per pot (labeled or not with 15n); four p rates as triple superphosphate: 0, 0.175, 0.350 and 0.700g p per pot; and sunnhemp and millet labeled or not with 15n. green manure dry matter provided 1 g n per pot. corn plants were evaluated for dry mass yield, accumulated n, and n utilization from green manures, urea, and the soil. the mineral fertilizer supplied the largest amount of n to the corn plants, followed by n from soil and from green manures. the n utilization from sunnhemp by corn plants was greater than the n utilization from millet. the phosphorus application increased the assimilation of n from urea and from green manures.
Marcha de absor??o do nitrogênio do solo, do fertilizante e da fixa??o simbiótica em feij?o-caupi (Vigna unguiculata (L.) walp.) e feij?o-comum (Phaseolus vulgaris L.) determinada com uso de 15N
Brito, Marciano de Medeiros Pereira;Muraoka, Takashi;Silva, Edson Cabral da;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000400014
Abstract: common bean (phaseolus vulgaris l.) and cowpea (vigna unguiculata (l.) walp.) are among the main sources of plant protein for a large part of the world population, mainly that of low income, and nitrogen is the main constituent of these proteins. the objectives of this study were to evaluate, through the 15n-dilution technique and using rice and non-nodulating soybean as control plants, the relative contributions of nitrogen sources (symbiotically fixed n, soil native n and fertilizer n) on the growth of common bean and cowpea and to compare the isotopic technique (id) with the difference methods (dm) for the evaluation of symbiotic n2 fixation. the study was carried out in a greenhouse of the center for nuclear energy in agriculture - cena/usp, sao paulo state, brazil, using 5 kg pots with a typic haplustox (dystrophic red-yellow latosol). the experiment was arranged in completely randomized blocks, with 16 treatments and three replications, in an 8 x 2 factorial design. the treatments were eight sampling times: 7, 24, 31, 38, 47, 58, 68 and 78 days after sowing (das) and two crops: common bean and cowpea. an n rate of 10 mg kg-1 soil was used, as urea, enriched with an excess of 10 % of 15n atoms. symbiotic n fixation supplied the bean and cowpea plants with the greatest amount of accumulated n, followed, in decreasing order, by soil and fertilizer. the highest rate of n symbiotic fixation was observed at the pre-flowering growth stage of the bean and cowpea plants. after the initial growth stage, 24 das, rice and non nodulating soybean were appropriate control plants to evaluate symbiotic n fixation. there was a good agreement between id and dm, except in the initial growth stage of the crops.
Rota??o de culturas e propriedades físicas e químicas em Latossolo Vermelho de Cerrado sob preparo convencional e semeadura direta em ado??o
Almeida, Vicente Pereira de;Alves, Marlene Cristina;Silva, Edson Cabral da;Oliveira, Simone Aparecida de;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000300031
Abstract: inadequate soil management has led to the degradation of physical, chemical and biological soil properties. the purpose of this work was to evaluate the yields and physical and chemical soil properties of a dystropherric red latosol (oxisol) in the third year of a crop rotation that included green manures, with soybean or corn (summer) and common bean (winter) crops. the following green manure species were used: velvet bean, millet, sunnhemp, pigeon pea, cultivated under conventional tillage and recently adopted no-tillage. the experiment was conducted in selvíria, mato grosso do sul, brazil, in the 1999/2000 growing season. the experiment was arranged in a randomized complete block design with split-split plots and four replications. after three years of crop rotation under no-tillage the soil physical properties had degraded mostly in the surface layer. on the other hand, in this system and soil layer, there was an increment in organic matter content and ph. there also was obtained greater corn grain yield under not-tillage as compared to the conventional tillage. the yield of common bean was higher when it was cultivated following the corn crop under conventional tillage and after soybean under no-tillage.
Psicanálise, saber e conhecimento
Rodrigues, Ana Cabral;Costa, Carlos Alberto Ribeiro;Silva, Marcos Eichler de Almeida;Silva, Edson Pereira da;
Revista do Departamento de Psicologia. UFF , 2005, DOI: 10.1590/S0104-80232005000200009
Abstract: towards the end of 19th century, a revolution takes place in the field of knowledge production: freud, marx and nietzsche introduce the idea of a not totally guaranteed certainty. afterwards, g?del demonstrates the possibility of contradiction in a given logical system. parting from these premises, this assay studies the knowledge production conditions in psychoanalysis and proposes a two way analysis: thinking psychoanalysis from an epistemological point of view, as well as thinking the contribution of psychoanalysis theory of inconscient to an epistemology. we believe that the study of this relation is an important epistemological question, relevant to the comprehension of scientific activity as a whole.
Análise econ mica da aduba o nitrogenada no milho sob plantio direto em sucess o a plantas de cobertura em Latossolo Vermelho = Economic analysis of nitrogen fertilizer in corn crop under notillage in succession to cover crops in Red Latosol
Edson Cabral da Silva,Takashi Muraoka,Rodrigo Otávio Camara Monteiro,Salatiér Buzetti
Acta Scientiarum : Agronomy , 2007,
Abstract: O nitrogênio é o nutriente mais absorvido e oneroso na produ o do milho. O estudo foi desenvolvido na Fazenda experimental da Feis/Unesp, Selvíria, Estado de Mato Grosso do Sul. Os objetivos foram avaliar, em termos econ micos, a melhor dose e época de aplica o do N, na forma de uréia, no milho sob plantio direto em sucess o à crotalária juncea, milheto e ao solo em pousio e quantificar a contribui o do N proveniente dos adubos verdes, equivalente ao N do fertilizante uréia. O delineamento foi o de blocoscasualizados com 24 tratamentos e quatro repeti es, em esquema fatorial 3 x 3 x 2 + 6, três doses de N: 80, 130 e 180 kg ha-1; três sistemas de cobertura do solo: crotalária, milheto e pousio; duas épocas de aplica o do N: estádio quatro ou oito folhas e seis tratamentos adicionais (três sem N e três com 30 kg ha-1 de N na semeadura). O cultivo do milho em sucess o à crotalária e a aplica o do N no milho com quatro folhas em sucess o ao milheto e ao solo em pousio proporcionaram maior produtividade física e econ mica de gr os. Nitrogen is the most absorbed nutrient and also the most expensive in corn crop production. This study was conducted at the Experimental Farm of Unesp/Feis, located in Selvíria, state of Mato Grosso do Sul,Brazil. One objective was to evaluate, in economic terms, the best rate and time of N application, as urea, in corn crop grown under no-tillage in succession to sunnhemp, millet and fallow ground. The study also aimed to quantify the contribution of N from greenmanure equivalent to N from urea fertilizer. The experiment was designed in randomized complete blocks, with 24 treatments and four replications in an incomplete factorial, 3 x 3 x 2 + 6, three N rates: 80, 130 and 180 kg N ha-1; three preceding cover crops: sunnhemp, millet and fallow ground; two N application time: stage four leaves or eight leaves; and six additional treatments (three without N application and three that received 30 kg N ha-1 atseeding). The corn crop in succession to sunnhemp and the application of N in the four leaves stage in succession to millet and fallow ground soil promoted larger physical and economical grains yield.
Page 1 /54289
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.