Sistema plantio direto do repolho sob diferentes plantas de cobertura

Abstract

The conventional tillage system (SPC) of the soil in the production of vegetables consists of turning over superficial layers to form beds, causing soil disruption. The no-tillage system of vegetables (SPDH) is an alternative for a more sustainable management in the production of vegetables, with a view to a more conservationist management of soil and water. Thus, the objective of this work was to evaluate the effect of different species of summer cover crops on nutrient cycling, soil physical attributes and cabbage productivity in no-tillage system. The study was carried out in the municipality of Cerro Largo, RS, from January 2022 to December 2022. With a randomized block experimental design, the following coverages were used: Sudan grass, millet, jack bean, crotalaria -juncea and fallow. The production of dry mass (DM), concentration of nutrients in the aerial part of the species, soil density (Ds), total porosity (PT), macroporosity, microporosity, volumetric humidity, temperature and productivity of cabbage were evaluated. The results were submitted to analysis of variance (ANOVA) in which means were compared by Tukey's test at 5% significance. In the edaphoclimatic conditions where the experiment was carried out and considering the second year of results, it is concluded that the soil parameters evaluated in the layers 0-10 to 10-20 cm did not have significantly different values. The temperature parameter showed a significant difference between the treatments, mainly the fallow period where a greater thermal amplitude was verified. Millet showed higher dry mass production, and higher concentrations of carbon, phosphorus, potassium, magnesium and sulfur in the aerial part of the plant. The highest levels of nitrogen and calcium are found in jack beans, as well as the highest productivity in cabbage. Thus, the use of millet and jack bean as green manure is an alternative for sustainable agriculture.