Agricultural Sciences
Mostrando 37-47 de 47 artigos, teses e dissertações.
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37. Deposition of spray solution in the soybean crop according the type of nozzle and volume applied / DeposiÃÃo da calda de pulverizaÃÃo na cultura da soja em funÃÃo do tipo de ponta e do volume aplicado
To prevent the losses in agriculture has been the great objective of the Engineers Agronomists, as well as professionals of other similar areas of agrarian sciences that are worried very about the losses in agriculture, including the fitossanitÃria area. Most of the time, during the chemical control of plagues, harmful illnesses and plants, give to much imp
Publicado em: 2006
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38. ABSORÇÃO DE FÓSFORO POR PLANTAS DE SOJA, COM O AUMENTO DO pH EM LATOSSOLOS ARGILOSOS / AVAILABILITY OF PHOSPHORUS IN TWO CLAYEY LATOSOILS AND ITS ACCUMULATION IN SOYBEAN AS A FUNCTION OF THE INCREASE IN PH
To take better advantage of the P applied along the year and of the soil residual by the adequate use of lime, especially in soils cultivated and manured for many years, may be an economically viable practice, as lime is much less expensive than phosphate fertilizers, which may imply important increment in the profit margin for the farmer. Two experiments we
Publicado em: 2006
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39. AVAILABILITY OF PHOSPHORUS IN TWO CLAYEY LATOSOILS AND ITS ACCUMULATION IN SOYBEAN AS A FUNCTION OF THE INCREASE IN PH / ABSORÇÃO DE FÓSFORO POR PLANTAS DE SOJA, COM O AUMENTO DO pH EM LATOSSOLOS ARGILOSOS
To take better advantage of the P applied along the year and of the soil residual by the adequate use of lime, especially in soils cultivated and manured for many years, may be an economically viable practice, as lime is much less expensive than phosphate fertilizers, which may imply important increment in the profit margin for the farmer. Two experiments we
Publicado em: 2006
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40. Semillas de Spondias tuberosa oriundas de frutos cosechados en cuatro estadios de maduración y almacenadas
The peculiar climatic conditions of the semi-arid area offer plants for the human exploration in natural a way among these, stands out the Spondias tuberosa Arruda Câmara, whose fruit is havested in an extractive and disorganized way, putting in risk its perpetuation. The objective of this study was to verify the storage period of the seeds, the environment
Revista Brasileira de Engenharia Agrícola e Ambiental. Publicado em: 2005-09
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41. O papel das Escolas Superiores de Agricultura na institucionalização das ciencias agricolas no Brasil, 1930-1950 : praticas academicas, curriculos e formação profissional / Institutionalization of agricultural science in Brazil, 1930-1950, the contribution of agricultural schools through their academical practices, curricular structure and professional profiles
The main objective of this doctoral thesis is to comprehend the contributions of agricultural schools in the institutionalization of agricultural sciences between 1930 e 1950. Four schools were focused in this study - the Escola Superior de Agricultura Luiz de Queiroz , Escola Nacional de Agronomia, Escola Superior de Agricultura do Estado de Minas Gerais em
Publicado em: 2005
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42. ProduÃÃo de FeijÃo Caupi (Vigna unguiculata (L.) Walp)AtravÃs da InfiltraÃÃo Subsuperficial de Esgoto DomÃstico em Solo Arenoso. / COWPEA BEANS PRODUCTION (Vigna unguiculata (L.) Walp), THROUGH THE SUB-SUPERFICIAL INFILTRATION OF DOMESTIC SEWAGE INTO SANDY SOIL
The production of cowpea beans (Vigna unguiculata (L.) Walp.) was evaluated in a real scale in this research project, by using the disposal of domestic sewage into the soil through the sub-superficial infiltration. The research was carried out during two periods. The first one was in the rainy season from January to April, and the second one in the dry seaso
Publicado em: 2005
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43. "Metodologias para geração e atualização de mosaicos de fotos aéreas no Projeto ARARA" / Methodologies for generation and updating of aerial photographs mosaics in the ARARA Project
The generation of photographic mosaics is an important activity in many areas such as map production, environment monitoring and agricultural management. Photogrammetry, and specially aero-photogrammetry, are the sciences that deal, among other subjects, with mosaic generation using time consuming procedures, making the maintenance and updating of photograph
Publicado em: 2004
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44. Microclimate and gerbera growth under different greenhouse covers. / Microclima e produção de gérbera em ambientes protegidos com diferentes tipos de cobertura.
The objective of this work was to evaluate the influence of white polyethylene as a greenhouse cover and its association with different shading screens (thermal screen and black screen) on the following environmental elements: incoming solar radiation (Qg), photosynthetically active radiation (PAR), temperature (T), relative humidity (RH) and evapotranspirat
Publicado em: 2003
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45. Characterization of soils degraded by the agricultural activity and biological changes after reforestation with different species associations of the Atlantic Forest / Caracterização de solos degradados pela atividade agrícola e alterações biológicas após reflorestamentos com diferentes associações de espécies da Mata Atlântica
This study seeks to: a) characterize the degree of physical and chemical degradation of the soils used in agricultural cultivation for several decades, originally covered by the Atlantic Forest (Seasonal Semideciduous Forest) in Botucatu, SP; b) evaluate the biological changes of these soils along a 16-month post-reforestation with different models of specie
Publicado em: 2001
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46. Long-term changes in Serengeti-Mara wildebeest and land cover: Pastoralism, population, or policies?
Declines in habitat and wildlife in semiarid African savannas are widely reported and commonly attributed to agropastoral population growth, livestock impacts, and subsistence cultivation. However, extreme annual and shorter-term variability of rainfall, primary production, vegetation, and populations of grazers make directional trends and causal chains hard
The National Academy of Sciences.
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47. The current biodiversity extinction event: Scenarios for mitigation and recovery
The current massive degradation of habitat and extinction of species is taking place on a catastrophically short timescale, and their effects will fundamentally reset the future evolution of the planet's biota. The fossil record suggests that recovery of global ecosystems has required millions or even tens of millions of years. Thus, intervention by hum
The National Academy of Sciences.