A ESCARIFICAÇÃO DO SOLO EM SISTEMA DE PLANTIO DIRETO AFETA A ESTABILIDADE DE AGREGADOS E O TEOR DE MATÉRIA ORGÂNICA EM LATOSSOLO VERMELHO

Abstract

Soil scarification in the Straight Planting System (SPD) is an alternative for the rupture of compacted layers that prevent the root development of plants, aeration and water circulation in the soil during the years of management. Scarification entails some effects on the physical behavior of the soil, in the long term cause negative effects like reduction of carbon stock, and / or positive as increased water infiltration. The objective of this study was to evaluate the effect of scarification on the stability of aggregates and soil organic matter contents in different years of post - scarification management. For this, an experimental area was used on the same slope and on the same soil type with different treatments: native forest; SPDs (no scarification); SPD₁ (1 year post scarification); SPD₃ (3 years post scarification) and SPD₄ (4 years post scarification). The results showed that the aggregate stability index increased in the years after scarification and the organic matter content decreased, showing extrinsic effects on the increase of aggregate stability.