Cadusafós sobre a microbiota e desempenho agronômico das culturas de soja e milho em Mato Grosso

Abstract

The increase in the production of grains associated to monoculture has contributed to a large extent the increase in the incidence of pests. In order to avoid possible losses resulting from the action of nematodes, among them, present in the soil, it has as an alternative, the use of nematicides. The use of these molecules in agricultural systems brings concerns about the permanence of these chemicals in the environment, Because they can accumulate. This study aimed to evaluate the the effect of different doses of cadusafós on soil microbiota and on the agronomic performance of soybean crop, as well as their possible residual effect on the agronomic performance of maize crop, in a Red Yellow Latosol. Experiment was arranged in a randomized block design (DBC), with 4 treatments: Recommended dose (0.8 kg a.i ha-1 of cadusafós); twice the recommended dose (1.6 kg a.i ha-1 of cadusafós); three times the recommended (2.4 kg a.i ha-1 of cadusafós) with 5 replications. To do this we evaluated the agronomic performance of cultures, forming unit of colonies of fungi and bacteria (UFC) and soil microbial biomass carbon (CBM). With the increase of the doses of cadusafós, the soybean plants grew less, however, did not affect the productivity of the crop. It was found possible residual effect of cadusafós on the development of the corn crop. With the increase in the dose of cadusafós applied to the soil, there was a reduction in the density of bacteria and fungi and also a reduction in soil microbial biomass carbon (CBM) emphasizing the importance of the use of the recommended dose.