Agregação do solo em sistema de integração lavoura pecuária leiteira

Abstract

In an integrated system of agricultural production, the soil structure, especially aggregation, can be affected by the intense trampling of animals reconciled with high stocking rates, large size of dairy cattle and inadequate soil moisture conditions for grazing. As an alternative to soften these impacts caused by the animals and traffic of agricultural machines, mechanical soil chiseling is used in order to reverse the compaction process. The objective of the present work is to evaluate the soil aggregation in the layers 00-10 and 10-20 cm in the soybean (Glycine max) and maize (Zea mays) crops after two years of different husbandry integration and the relation with the clay dispersed in water and flocculation degree. The experiment was carried out in a rural property in the municipality of São Pedro do Butiá-RS, where the experiment was installed in the year 2015 with the treatments: No-tillage area without grazing in the winter (T1), no-till area with grazing on the winter (T2), and area with mechanical soil chiseling and no-till after winter grazing (T3). The experimental design was a randomized block design with four replications. The results were submitted to analysis of variance and Tukey's test, at 5% probability. The methodology used was followed according to the Kemper and Chepil Standard (1965). DMG and DMP did not differ between treatments, nor was there any significant relationship with the clay dispersed in water and flocculation degree.