Influence of planting systems on the chemical characteristic of substratum of clay mining digging.

Abstract

The decrease in the organic matter and nutrients contents in eucalyptus plantings has been the negative factor in the ecological sustainability of those areas. The objective of this work was to evaluate the effect of planting systems (pure and mixed) in the chemical attributes of clay mining digging. Were two experiments implanted, one constituted by Eucalyptus camaldulensis, E. tereticornis, E. robusta. and E. pellita in pure plantings, and other with the same eucalyptus species mixed with Sesbania virgata. The two experiments were carried out in Randomized block design with 4 replications. Substratum samples were collected, before and one year eucalyptus out planting, at 0-20 and 20-40 cm depths. For analysis of the planting system effects on the chemical characteristics of the substratum was applied the t test. The mixed plantings reduced a lot the sum of bases (SB) and cation exchange capacity (CEC) in relation to the pure plantings. However, in the treatments with E. tereticornis there was no alteration of the nutrient contents, of SB and CEC of the substratum. The organic matter did not decrease in none of the plantings.