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Search Results: 1 - 10 of 707642 matches for " Napole?o E. de M.;Bruno "
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Cultivares, épocas de plantio e componentes da produ??o no consórcio de algod?o e amendoim
Araújo, Afranio C. de;Beltr?o, Napoleo E. de M.;Bruno, Genildo B.;Moraes, Martival dos S.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2006, DOI: 10.1590/S1415-43662006000200016
Abstract: the intercrops are practiced by small farmers aiming to favor not only the diet and the income of their families, but also to decrease the risks of production losses. it was aimed with this work to study the influence of cotton and peanut cultivars and relative planting times as intercroping, being verified the components of the production, vegetable productivity, as well as the quality of the products. the experiment was conducted in miss?o velha, ceará state, brazil, at cotton experimental field of embrapa in the agricultural year of 2002. inall 20 treatments were tested with 4 repetitions, in a randomized block with 2 x 2 x 4 + 2 + 2 factorial, the factors being two cultivars of cotton (brs 186 - precocious 3 and brs 201), two cultivars of peanut (l7 and br-1), four planting times (0; 7; 14 and 21 days) plus the isolated controls of the two cultivrs of cotton and peanut crops. the technological characteristics of the cotton fiber practically did not suffer influence of the intercroping, however, the yield of both cotton and peanut crops decrease as a function of cultivation system due to established competition between the two crops.
Fitotoxicidade e seletividade do herbicida trifloxysulfuron sodium na mamona cultivar BRS Nordestina
Ferreira, Uilma C. de Q.;Queiroz, Wilton N. de;Beltr?o, Napoleo E. de M.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2009, DOI: 10.1590/S1415-43662009000700014
Abstract: the castor been (ricinus communis l.) is a rustic plant, heliophile, resistant to drought, belonging to the family of euforbiace. it is characterized by being sensitive to several herbicides and the competition imposed by harmful plants. this work had as objective to study the influence of different doses of the herbicide trifloxysulfuron-sodium in different states of development of the castor been, cultivar brs nordestina. the experiment was conducted during 2006, in a greenhouse of embrapa - cotton at campina grande, pb. the experimental design was totally randomized, with a factorial 4 x 4 + 1 design, consisting of four doses 5.0; 7.5; 10.0 and 12 g ha-1 of trifloxysulfuron sodium and four stages of the development of the plant (leaves cotyledon, two true leaves, two expanded leaves and four leaves) and an absolute control. in total 7 treatments were tested with four repetitions. the variables measured were growth reduction and dry matter of the castor been of the to cultivar brs nordestina. it was verified, for the variable growth reduction, reflected by the height and size of the plants, that there was a significant effect for doses and stages of the development and the interaction among them, and the youngest plants were more sensitive to the product. the herbicide that acts in the leaves and root, was phytotoxic to the castor been, cultivar brs nordestina, even in the lowest tested dose.
Uso adequado de casa-de-vegeta??o e de telados na experimenta??o agrícola
Beltr?o, Napoleo E. de M.;Fideles Filho, José;Figueirêdo, Ivana C. de M.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2002, DOI: 10.1590/S1415-43662002000300029
Abstract: this paper reviews the main factors affecting the use of greenhouses in agricultural experimentation. the effects of water quality, air temperature and solar irradiance are discussed along with size, placement and color of pots/recipients and use of water in irrigation. green screen should be avoided in greenhouses as they reflect the green light while absorbing the photosynthetically active red light. all the pots/recipients must be of the same color and size.
Aduba??o do algod?o colorido BRS 200 em sistema organico no Seridó Paraibano
Silva, Melchior N. B. da;Beltr?o, Napoleo E. de M.;Cardoso, Gleibson D.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2005, DOI: 10.1590/S1415-43662005000200012
Abstract: the naturally colored cotton has potentiality for growth in northeast semi-arid, where the edaphoclimatic conditions permit the cultivation without agrochemicals. organic fertilizers have been used to improve physico-chemical properties of the soil, establishment of beneficial microorganisms, increase of the organic matter and nutrients. the objective of this work was to determine levels and forms of application of cattle manure in colored cotton brs 200, cultivated under organic management in seridó, in the state of paraiba. the experiment was conducted in randomized blocks, with nine treatments and four replications, during 2000, 2001 and 2002. the treatments were originated from a factorial 4x2+1, consisting of four levels of decomposed cattle manure (10, 20, 30 and 40 t ha-1) and two sites of application (below and by the side of seeds), plus an absolute control without organic manure. organic fertilization increased the cotton yield. under regular climatic conditions, the sidewise application was more efficient, reaching the maximum yield with 30 t ha-1. the uniformity of fiber length decreased and the index of short fibers increased with the increment of the levels of organic manure.
Desenvolvimento de uma régua para medidas de área foliar do algodoeiro
Fideles Filho, José;Beltr?o, Napoleo E. de M.;Pereira, Antonildo S.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010000700008
Abstract: the objective of this research was to develop and validate a ruler that measures the leaf area of the cotton plant, in a quick and non-destructive manner and directly in the field. ninety days after the emergence of the crop, leaf samples of tencotton plants of cultivar brs 187 8h were collected, of which all leaves were removed to prepare the samples and, after that, they were photocopied and length measurements were done with the help of a planimeter to define the range of the ruler. in the second stage of the experiment, the cultivars brs safira, brs 201 and brs verde were used to test the ruler. the analysis of regression between the leaf area measured in samples of leaves and the estimated areas showed a good adjustment with coefficient of determination equal to 0.95. comparing the means of both the methods, it was verified that the mean leaf area of the four cultivars of cotton, measured with the proposed ruler, did not differ statistically from the mean area measured with the planimeter. the ruler can be recommended to determine, directly in the field, the leaf area of cotton cultivars with cordiform and planofile leaf structure, in relation to the horizontal.
Atividade microbiana em solos, influenciada por resíduos de algod o e torta de mamona Microbial activity in soils influenced by residues of cotton and castor bean presscake
Silvia Capuani,Jo?o P. G. Rigon,Napoleo E. de M. Beltr?o,Jósé F. de Brito Neto
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/s1415-43662012001200002
Abstract: A atividade microbiana n o se constitui apenas como bom indicador da qualidade do solo, mas é influenciada pela adi o de carbono no sistema, o qual serve como substrato aos micro-organismos que aumentam sua atividade e a libera o de CO2, compreendendo a respira o edáfica do solo. Objetivou-se, neste trabalho, avaliar a atividade microbiana em diferentes tipos de solo com a adi o de torta de mamona e resíduo têxtil de algod o. O trabalho foi conduzido em casa de vegeta o na sede da Embrapa Algod o, em delineamento de blocos casualisados em esquema fatorial 4 x 3, com quatro repeti es. A intervalos predeterminados de 4 dias os recipientes foram abertos e a solu o de NaOH foi titulada com HCl 2 N na presen a de indicador ácido/base fenolftaleína. Após a leitura a mesma quantidade de NaOH foi reposta e os recipientes novamente fechados. A diferen a entre a quantidade de ácido necessária para neutralizar o hidróxido de sódio no recipiente testemunha e nos tratamentos equivale à quantidade de gás carb nico produzido pelos micro-organismos do solo. Constatou-se que os resíduos influenciaram significativamente a atividade microbiana nos diferentes tipos de solo, sobretudo nas primeiras determina es, apresentando-se como boas fontes para mineraliza o e fornecimento de nutrientes, tendo a torta de mamona proporcionado maior libera o acumulada de CO2 pelos micro-organismos. Microbial activity constitutes a good indicator of soil quality, and is influenced by the addition of carbon in the system serving as a substrate for microorganisms that increase their activity and release of CO2, comprising the edaphic respiration of the soil. The objective of this study was to evaluate the microbial activity in different soil types with the addition of cake press of castor bean and cotton textile residue. The study was conducted in a greenhouse at the headquarters of Embrapa Cotton in randomized block design in 4 x 3 factorial arrangement with four replications. At predetermined intervals of 4 days, the containers were opened and the solution of NaOH titrated with HCl 2N in the presence of acid/base indicator phenolphthalein. After reading, the same amount of NaOH was added and the containers were closed again. The difference between the amounts of acid needed to neutralize the sodium hydroxide in a control container and the treatments was equivalent to the amount of carbon dioxide produced by soil microorganisms. It was found that the residues influenced the microbial activity in different soil types, especially in the initial determinations, presenting themselves
Produ??o e componentes do algodoeiro herbáceo em fun??o da aplica??o de biossólidos
Pedroza, Juarez P.;Haandel, Adrianus C. van;Beltr?o, Napoleo E. de M.;Dionísio, Jair A.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2003, DOI: 10.1590/S1415-43662003000300013
Abstract: under greenhouse conditions at the national center for cotton research (cnpa/ embrapa) effects of increasing doses of sewage sludge (biosolids) equivalent to 0, 150, 250, 350, 450, and 550 kg ha-1 of n, limed at 50%st were studied, on the variables of the production (production of cotton, weight of capsule, number of capsules, percentage of fibre and plumage weight) and components (aerial, root and total phytomass and the ratio between phytomass of aerial parts to root) of herbaceous cotton variety brs 187 8h. the experimental design used was in random blocks, with 6 treatments and 5 replications. each experimental unit, constituted of a plastic recipient of 90 dm3. according to the results obtained significant effects were observed by f test at 1% level of probabililty of the biosolid doses on the variables studied, except for the weight of capsule and percentage of fibre. with the regression analysis, linear increase of the variables was observed for the weight of cotton, plumage weight, aerial parts and total phytomass and the relation phytomass of aerial parts to root while a quadratic equation for the number of capsules per plant and root phytomass was found, the regression equations estimated biosolid doses equivalents to 441 and 231 kg n ha-1, respectively, for the maximum values for these variables.
Crescimento e produ??o de bagas da mamoneira irrigada com água residuária doméstica
Rodrigues, Luis N.;Nery, Aparecida R.;Fernandes, Pedro D.;Beltr?o, Napoleo E. de M.;Gheyi, Hans R.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2009, DOI: 10.1590/S1415-43662009000700003
Abstract: the objective of this study was to evaluate the impacts of irrigation with domestic wastewater on growth and production of seeds of castor bean (ricinus communis l) in greenhouse. the research was carried out between november, 2005 and may, 2006, at centro de tecnologia e recursos naturais (ctrn) of ufcg - pb. a randomized block design was used, with 5 x 2 scheme of factorial analysis with three replications, testing 5 levels of replacement of crop evapotranspiration - etc (0.60, 0.75, 0.90, 1.05 and 1.20 etc) and 2 cultivars of castor bean (brs nordestina and brs paragua?u). plant height, stem diameter, number of leaves and leaf area were evaluated at 48, 90, 132 and 174 days after sowing - das. production of seeds was evaluated at last date. castor bean irrigated with 0.60 etc in relation to 1.05 etc, had plant height, stem diameter, number of leaves, leaf area and production of seeds reduced by 23.45, 16.14, 26.23, 44.06 and 50.59%, respectively. the brs paragua?u had plant height significantly higher than the brs nordestina, along the research, while brs nordestina had larger leaf area at 48 and 90 das and production of seeds of both was equivalent. there was no significant interaction between the studied factors.
Análise de crescimento do feijoeiro submetido a quatro níveis de umidade do solo
Nóbrega, José Q.;Rao, Tantravahi V. R.;Beltr?o, Napoleo E. de M.;Fideles Filho, José;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2001, DOI: 10.1590/S1415-43662001000300012
Abstract: the research work was conducted at the experimental station of lagoa seca, located at the empresa estadual de pequisa agropecuária da paraíba, emepa-pb, with the objective of identifying the consequences of soil moisture content upon the growth variables of the bean (phaseolus vulgaris l.) crop. the statistical design used was the randomized blocks, with four treatments and four replications. the treatments were based on different irrigation levels: 80, 160, 320 and 140.2 mm, distributed in the different phenological phases of the crop and based on the results of the previous studies and in the soil humidity. the effects of the different irrigation regimes were evaluated by means of the growth variables, while total phytomass, leaf area, leaf area index, net assimilation rate and leaf area ratio which showed differentiated values in which response to the water treatments employed, with increased values in plants with higher supplies of water.
Viabilidade econ?mica de sistemas de preparo do solo e métodos de controle de Tiririca em algodoeiro
Arruda, Francineuma P. de;Andrade, Alberício P. de;Beltr?o, Napoleo E. de M.;Pereira, Walter E.;Lima, Jo?o R. F.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2005, DOI: 10.1590/S1415-43662005000400007
Abstract: weeds are responsible for significant losses in cotton production in the world and, its control is difficult and expensive. this work has the main objective to estimate production costs and analyse economically the efficiency of plasticulture and different methods of weeds control in irrigated and dry land herbaceous cotton, using data obtained in barbalha and miss?o velha areas, in the state of ceará, brazil, evaluating production costs, net revenues, profitability index and economic viability indicators: liquid present value (lpv), ratio of internal return (rit) and benefit-cost ratio (b/c). it was verified that in irrigated as well as in rainfed crop, the more efficient and economically viable weed control method was the mechanical method with conventional preparation of the soil, being more lucrative in rainfed crop, with higher lpv and rit. the high production per hectare was verified in irrigated crop, using as integrated system control in land preparation with moldboard plough. the plasticulture used a method of weed control is economically viable only for rainfed cotton.
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