Crop Pasture Rotation
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Compartimentos da matéria orgânica do solo sob sistemas de manejo e vegetação natural de cerrado / Soil organic matter pools under management systems and natural Cerrado vegetation
Different soil organic matter pools under management systems and natural Cerrado vegetation were studied. These pools were estimated using their carbon and nitrogen contents. Total soil organic carbon and total nitrogen (COT and NT), carbon and nitrogen of particulate organic matter (COP and NP), mineral-associated organic carbon and nitrogen (COM and NM), p
Publicado em: 2009
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14. Emissões de CO2, NOx e N2O em solos sob diferentes cultivos na região do cerrado / CO2, NOx and N2O emissions from soils to the atmosphere under differente cropping systems in the cerrado region
The objective of the study was to evaluate the CO2, NO, N2O emissions from Oxisols (Latossolos) under different no-till cropping systems in the Cerrado region (Central Brazil). The results are presented in three chapters. Chapter 1 presents a study on the effects of increasing doses of nitrogen fertilizer on the fluxes of trace gases along the crop cycle of
Publicado em: 2008
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15. Validation of the NUTMON model for the diagnosis of agricultural management: study on two family farms in Rio de Janeiro State. / Validação do modelo NUTMON para o diagnóstico do manejo agrícola: Estudo em duas propriedades familiares do Rio de Janeiro.
This study had the following hypothesis: the agricultural production systems adopted by small farmers brings about nutrient negative balances to soil, which causes the loss of soil fertility and crop yield decline in the time span. The general objective of this study was to validate the NUTMON model of the Food and Agriculture Organization of the United Nati
Publicado em: 2008
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16. Soil solution ion movement in plots under crop-pasture rotations / Movimento de íons em solo sob sistema de integração lavoura-pecuária na região de cerrados
The objective of this study was to evaluate the soil solution ion concentrations and vertical flux in experimental plots under the following systems: continuous crop, continuous pasture and crop-pasture rotations. The experiment was started in 1991, but the soil solution was collected during the years of 2005 and 2006. Porous capsules were installed in two s
Publicado em: 2007
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17. Seqüestro de carbono e alterações bioquímicas da matéria orgânica de solos cultivados com eucalipto / Carbon sequestration and biochemical changes in organic matter of soils cultivated with eucalyptus
The maintenance of soil organic matter (SOM) in commercial plantations of eucalyptus depends on the adoption of appropriate crop and soil management. Changes in inventories of C and the quality of the MOS caused by the use and soil management can be identified by quantifying the stocks of C in forest compartments (soil and plant) over time of cultivation, an
Publicado em: 2007
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18. Variabilidade espacial da qualidade físico-hídrica do solo de um sistema em produção agroecológica. / Spatial variability of physical - hydric soil quality of an agroecological production system
The knowledge of physical hydric soil quality indicators is crucial during planning and management of agriculture activities. Many articles had been written to identify and to correlate the physical hydric soil quality and crop production. However, the most part of the results are not reliable for mapping spatial variability, mainly in large areas. The objec
Publicado em: 2007
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19. Soil carbon and nitrogen stocks and fertility in areas in recuperation with leguminous trees and on shifting cultivation system area with high productivity. / Estoque de carbono, nitrogênio e fertilidade do solo em áreas em recuperação com leguminosas e em sistema de agricultura itinerante de alta produtividade .
This study aimed to evaluate carbon and nitrogen stocks restoration, and soil fertility status in land reclamation with nodulated and mycorrhizal legume trees and fallow length on high productivity shifting cultivation. Evaluations were made of soil C and N stocks, concentration of free and occluded light fraction and soil available Ca, Mg, P, K, C and N, an
Publicado em: 2007
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20. SOIL PHYSICAL ATTRIBUTES IN INTEGRATED SYSTEMS OF AGRICULTURE CATTLE-RAISING UNDER NO TILLAGE / ATRIBUTOS FÍSICOS DO SOLO EM SISTEMAS DE CULTURAS SOB PLANTIO DIRETO NA INTEGRAÇÃO LAVOURA-PECUÁRIA
The integration between agriculture and cattle-raising has growing up in the last few years in Rio Grande do Sul state, Brazil. With the aim to evaluate the changes in some physical soil properties caused by different summer crop systems and pasture winter grazing frequencies, an experiment was carried out in Jari, central part of the state, in a Nitosol. Th
Publicado em: 2005
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21. Fontes de crescimento e sistema produtivo da orizicultura no Mato Grosso. / Sources of growth and the productive system of rice crops in the state of Mato Grosso.
The current study aims to describe the rice production system and to quantify its sources of growth in the state of Mato Grosso, while competing with cotton, corn and soybean crops, between 1980 and 2001. Great technological advances have been observed in upland rice growing, reducing productive differences between the upland and the irrigated rice. In face
Publicado em: 2004