392 resultados para épocas de semeadura
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia - FEIS
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia (Produção Vegetal) - FCAV
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Pós-graduação em Agronomia (Ciência do Solo) - FCAV
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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O feijão comum possui notória importância socioeconômica, constitui uma das mais importantes fontes proteicas da dieta brasileira e juntamente com o arroz, proporciona uma dieta mais vantajosa e equilibrada em termos de aminoácidos. O objetivo desse trabalho foi avaliar o efeito das combinações de diferentes reposições hídricas nas fases vegetativa - I e reprodutiva - II, durante o ciclo do feijoeiro IAC Alvorada, e comparar o teor nutricional dos grãos. Foi utilizado o delineamento em blocos casualizados, com quatro repetições em fatorial 4 x 4, sendo quatro níveis de déficit hídrico 100, 80, 60 e 40% da evapotranspiração da cultura (ETc) e os mesmos níveis foram repetidos em duas fases de desenvolvimento da cultura do feijão (fases I e II). Cada parcela possuía as dimensões de 4 m x 1,8 m, totalizando 7,2 m2 de 0,45 m. Inicialmente irrigou-se pelo sistema aspersão convencional em um período de 60 minutos diariamente, posteriormente o sistema adotado foi por gotejamento, conforme cada tratamento de restrição hídrica. Avaliaram-se os teores nutricionais de macro (N, P, K, Ca, Mg e S) e micronutrientes (B, Cu, Fe, Mn e Fe). A interação entre as lâminas nas fases I e II influenciou nos teores de micronutrientes Fe e S em grãos de feijão. Houve aumento dos teores de Fe e diminuição dos teores de Cu, Mn e B com a deficiência hídrica em uma das fases. Os macro e micronutrientes mais extraídos foram N, P, K, Fe, B e Mn. O N e o P são os nutrientes exportados em maior quantidade pelos grãos.
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This study aimed to evaluate a period of 38 years, the use and soil occupation of the Paradise River watershed, inserted in the citys of São Manuel and Areiópolis-SP using aerial photographs for the year 1972 and TM image (Thematic Mapper) obtained by the Landsat-5 satellite, in 2010, using geoprocessing techniques. The watershed in question is very important for the city of São Manuel-SP, because its urban area is inserted in its divisors which part of it belongs to the Environmental Protection Area (APA) Perimeter Botucatu-SP, considered a recharge area of the aquifer Guarani. Today, the development of agriculture faces challenges, which is to produce more food without impacting the environment. Allied to this concern, research institutions have sought new technologies that allow the detection and quantification of human actions, enabling interventions in order to minimize possible damage to the environment. Among these technologies can be cited Geographic Information Systems (GIS), which a large volume of data and information stored in a region at different times can be evaluated in the same time, suggesting different approaches to the planning of land use. The results of the mapping of areas of use and soil occupation result nine classes in 1972, and the coffee culture showed the biggest occupation (37.94%) of the total area. The 2010 mapping formulated twelve classes of use, which demonstrated the predominance of sugar cane (37.94%), on the areas occupied by coffee and pasture before. The land use maps of 1972 and 2010 showed results that show intense human activity in the modification of natural landscape.
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The current paper had as its objective to analyze the precision planter's operational performance according to five different displacement velocities and two types of jumpers for planting no-tillage corn. The utilized experimental delineation consisted of blocks at random with parcels subdivided in factorial scheme 2x5, two types of jumpers (4 and 5 staples) and five different displacement velocities (3.0; 4.5; 5.0; 7.0 e 9.0 km h-1) with four repetitions and by applying the average comparation test, as for the jumpers effects as for the displacement velocities effects, to the significance level of 5%. It was evaluated the data concerned to the longitudinal distribution of plants, average number of days for the emergence of seedlings, initial and final stand of plants, survival indices, mechanical harm on seeds, germination tests and grain production. It was also observed the planter displacement velocity effect of on variables as: longitudinal distribution of plants, average number of days for the emergence of seedlings, initial and final stand of plants, mechanical harm and yield. The survival indice of plants were high for all the studied velocities and jumpers. Among the studied velocities, the one of 5.0 km h-1 presented the highest yield to both types of jumpers.
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The present work is about a comparative study of two methodologies (MIALHE and ASABE), used to calculate the cost per hectare in the tillage operation in the culture of corn. The methodology of ASABE presents a higher cost per hectare in relation to the MIALHE proposal, being that the methodologies presents similar costs related to the depreciation expenses, accommodation and insurance. The differences were that in the ASABE proposal, the biggest expenses involved the payment of interest, fuel, lube and handwork, while in the MIALHE methodology, only the expense regarding to maintenance was more. The methodology of ASABE most suitable for management costs per hectare.
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Several factors induce soybean growers to seek new alternatives to increase productivity, in order to always surpass the previous harvest. In an attempt to meet this need in order to become more competitive, new technologies emerge. Currently, for example, the plantation system crossover, double row and dense, gaining media coverage and among researchers, aroused interest in research institutions. To date, there are still few studies with a scientific concrete, quantifies the real benefit of these cropping systems. The technique consists of sowing planting crossed the same area twice at right angles, forming checkerboard. In the planting row and the denser planting increases the number of plants per hectare, but the way they are arranged is what differentiates. Apparently these systems imply some issues, such as the use of inputs that the principle would double, as the plant population in the area will be changed, so possibly the incidence of insect pests and pathogens increase in these cropping systems. The purpose of this literature review is to provide updated information on technology, benefit from it, as it is being used and the research being conducted to provide scientific basis for soybean producer.
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The objective of this research work was to evaluate the effects of doses and time of application of N on the C/N ratio of the straw cover and on the growth and productivity of maize plants growing in a no tillage system. The experiment was carried out at the Experimental Farm of the College of Agriculture of the São Paulo State University (UNESP) on its campus of Botucatu, state of São Paulo, Brazil. The treatments were distributed in the field according to a randomized complete block design in a split plot arrangement. The treatments consisted of four doses of N (0, 20, 40, and 60 kg ha-1 ) applied to oat crop and N doses (60, 80, 100, and 120 kg ha-1 ) sidedressed to corn. The development and productivity of the maize crop in a no-tillage system were found to be dependent of the C/N ratio and the straw cover. The response of the maize plants to the early application of N is dependent on doses and time of application.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)