Manejo da pastagem e sua inter-relaÃÃo com atributos fÃsicos do solo. / Pasture management and itâs inter-relationship with soil physical attributes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The work was performed on agricultural properties, located on the hydrographyc sub-basins of the Santa Cruz and Ãgua 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 Ãgua 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 itâs sensibility related to soil physical attributes in which they were found.

ASSUNTO(S)

management soil physical manejo e conservacao de pastagens fÃsica do solo manejo pasture pastagem

Documentos Relacionados