dissertação
Manejo da pastagem e sua inter-relação com atributos físicos do solo.
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UNIVERSIDADE FEDERAL DE LAVRAS
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Programa de Pós-Graduação
DCS - Programa de Pós-graduação
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O trabalho foi realizado em propriedades rurais localizadas nas sub-bacias hidrográficas dos ribeirões Santa Cruz e Água Limpa, as quais pertencem à bacia do Rio Grande, em Lavras, MG, com o objetivo de avaliar e correlacionar os atributos físicos do solo com as características das pastagens do ponto de vista produtivo e bromatológico. Por meio da análise química de solo, constatou-se que a sub-bacia Santa Cruz apresenta, de modo geral, melhor condição de fertilidade em relação à Água Limpa. No entanto, a limitação de fertilidade em ambas as áreas reflete negativamente na qualidade das pastagens. Em todas as amostras de solo analisadas observou-se um elevado teor de matéria orgânica. O pisoteio de animais nestas pastagens, na lotação observada e em sistema de pastejo contínuo, não levou, principalmente na camada de 0-10 cm, à obtenção de maiores valores para densidade do solo (Ds) em relação à subsuperfície. Independentemente do tipo de pasto e profundidade, os valores de VTP variaram, em média, de 44% a 55%. Como tendência geral, não houve diferenças entre os valores de microporosidade nos solos sob os diferentes tipos de pastos, assim como entre as diferentes profundidades coletadas. Embora o efeito de profundidade tenha sido não significativo, observa-se a tendência de maiores valores de microporosidade na camada superficial em relação à subsuperficial. Na avaliação da estabilidade de agregados pelo diâmetro médio geométrico (DMG), foi observada a mesma tendência dos outros atributos avaliados no comportamento deste. Verificou-se que as maiores correlações ocorreram entre os valores de produção de massa seca por hectare e os valores do DMG e agregados acima de 2 mm. As características avaliadas das pastagens mostram o reflexo de pastagens degradadas. Pela correlação canônica verificou-se que as características bromatológicas das pastagens mostram alguma associação na sua sensibilidade relacionada aos atributos físicos do solo em que se encontram.
The work was performed on agricultural properties, located on the hydrographyc sub-basins of the Santa Cruz and Água Limpa streams, belonging to the Rio Grande basin, Lavras, MG, with the objective of evaluating and correlating soil physical attributes with pasture bromatological and productive aspects. Through soil chemical analysis, it was found that Santa Cruz sub-basin presented, in an overall way, better fertility conditions in relation to Água Limpa. However, the fertility limitation in both areas reflects negatively in the pasture quality. In all soil samples analyzed high organic matter content was observed. The animal harsh treatment on these pastures, considering the amount of animals observed in the area and the continuous system of pasture, did not provoke higher values of bulk density, mainly at 0-10cm depth, than the subsurface layer. The total volume of pores values varied, in average, from 44 to 55%, independently of pasture type and sampling depth. As a general tendency, there were no differences between micro-porosity values in the soil under different types of pastures, also as no difference was observed between sampling depths. Although the depth sampling effect was not significant, a tendency of higher values of macro-porosity was observed in the superficial layer in comparison to the sub-superficial layer. On the aggregate stability evaluation through the average geometric diameter (DMG), the same tendency of the other evaluated attributes was observed. It was observed that the highest correlations occurred between dry matter production per hectare values and DMG and aggregates above 2 mm values. The pasture characteristics that were evaluated showed the reflex of degraded pastures. Through canonical correlation it was verified that pasture bromatological characteristics showed some association in it´s sensibility related to soil physical attributes in which they were found.
The work was performed on agricultural properties, located on the hydrographyc sub-basins of the Santa Cruz and Água Limpa streams, belonging to the Rio Grande basin, Lavras, MG, with the objective of evaluating and correlating soil physical attributes with pasture bromatological and productive aspects. Through soil chemical analysis, it was found that Santa Cruz sub-basin presented, in an overall way, better fertility conditions in relation to Água Limpa. However, the fertility limitation in both areas reflects negatively in the pasture quality. In all soil samples analyzed high organic matter content was observed. The animal harsh treatment on these pastures, considering the amount of animals observed in the area and the continuous system of pasture, did not provoke higher values of bulk density, mainly at 0-10cm depth, than the subsurface layer. The total volume of pores values varied, in average, from 44 to 55%, independently of pasture type and sampling depth. As a general tendency, there were no differences between micro-porosity values in the soil under different types of pastures, also as no difference was observed between sampling depths. Although the depth sampling effect was not significant, a tendency of higher values of macro-porosity was observed in the superficial layer in comparison to the sub-superficial layer. On the aggregate stability evaluation through the average geometric diameter (DMG), the same tendency of the other evaluated attributes was observed. It was observed that the highest correlations occurred between dry matter production per hectare values and DMG and aggregates above 2 mm values. The pasture characteristics that were evaluated showed the reflex of degraded pastures. Through canonical correlation it was verified that pasture bromatological characteristics showed some association in it´s sensibility related to soil physical attributes in which they were found.
Abstract
Descrição
Área de concentração
Solos e Nutrição de Plantas
Linha de pesquisa
Agência de desenvolvimento
Palavra chave
Marca
Objetivo
Procedência
Impacto da pesquisa
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Citação
MACIEL, G. A. Manejo da pastagem e sua inter-relação com atributos físicos do solo. 2006. 70 p. Dissertação (Mestrado em Ciência do Solo)-Universidade Federal de Lavras, Lavras, 2006.