Aspectos relacionados a qualidade de um solo no terceiro ciclo de produção em sistema de plantio direto de hortaliças orgânico em Laranjeiras do Sul - PR

Abstract

The no-till vegetable system is a promising production alternative. The aim of this study was to verify aspects related to the quality of soil in the third cycle of organic SPDH production in Laranjeiras do Sul, Paraná. In this crop cycle, the area of the experiment was increased and divided into three plots (T1, T2 and T3). In the summer, a polyculture of Crotalaria juncea L. + Pennisetum sp. L. + Canavalia ensiformis L., at a density of 30 + 25 + 15 k ha-1, respectively. In winter, a consortium between Vicia sativa L., Secale cereale L., Raphanus sativus L. and Avena strigosa Schreb at a density of 50 + 40 + 15 + 75 kg ha-1. The assessments carried out were soil chemical analysis, carried out at depths of 0-10 cm and 10-20 cm; soil water retention capacity (WRC) and basal soil respiration (BSR) and crop dry matter. The results of the study indicated, at both depths, reductions in the levels of magnesium, potassium, phosphorus and base saturation below the level required by vegetables, while calcium, pH, CTC and M.O had slight drops, but are still at high levels. In the deep layers there was a greater presence of aluminum, and at T2 the content remained 0.0. CRA and RBS decreased, caused by the collection period or by changes in soil aggregation, as well as a decrease in microbial activity. The cover crops produced adequate M.O and contributed to the reduction of weeds.