Aplicação em sulco de nematicidas em soja

Abstract

The aim of this study was to evaluate the effect of cadusafos and Fluensulfone nematicides applied at three different depths and positions in the soybean planting in furrow, in order to control Meloidogyne javanica, Pratylenchus brachyurus end Heterodera glycines. The experiments were cared out in the field naturally infested by nematodes, Júlio de Castilhos city - RS. It was nine treatments and five replications in a randomized block design, totaling 45 experimental units per experiment. The treatments were: 1 check treatment; 2 - position 1 (nozzle installed on the upper furrower); 3 - Position 2 (nozzle installed at the bottom of the open furrow); 4 - Position 3 (nozzle installed in the distribution disc of seeds); 5 - Positions 1 and 2 associates; 6 - The positions 2 and 3 associates; 7 - Positions 1 and 3 associates; 8 Full seed treatment by Avicta completo (abamectin (30 g ai.ha-1) + thiamethoxam (42 g ai.ha-1) + fludioxonil (1.5 g ai.ha-1) + metalaxyl-M (1.2 g ai.ha-1 ) + thiabendazole (9 g ai.ha-1) and 9 - position 1 and Avicta completo treatment seeds associated. The variables measured in the experiment were: number of nematodes in the soil, number of nematodes on the roots, shoot dry weight, plant height (pre-harvest); number of pods per plant and Yield. The results showed significant reduction in the population of nematodes in the both soil and the roots, regardless of the nematicide. For the deposition positions in soil, the responses were vary according to the species of nematodes in the soil.