Desempenho agronômico da soja sob diferentes rotações e sucessões de culturas em sistema plantio direto

Abstract

The aim of this work was to evaluate the agronomic performance of soybean in different rotations and successions of crops in no tillage system. The experiment was carried out in the 2005/06 season, in a Dystroferric Red Latosol of the Agrarian Science Experimental Farm of Federal University of Great Dourados – UFGD, in Dourados, MS. Experimental design was in randomized blocks with seven treatments and three replications. Plots had 36m length and 11 m wide (396 m2) were 26 soybean lines were sowed with 36 m length, spaced among theirselves 0.45m. Treatments were seven systems of rotations or successions of crops which were established: System 1: soybean/ vetch+oat+turnip/ corn/ crotalaria+vetch/ soybean; System 2: soybean/ sunflower/ corn/ vetch+oat+turnip/ soybean; System 3: soybean/ oat+crotalaria/ corn/ sunflower/ soybean; System 4: corn/ crotalaria/ corn/ vetch/ milheto/ soybean; System 5: soybean/ corn/ soybean/ corn/ soybean/; System 6: rice / corn / soybean/ wheat / soybean and System 7: soybean/ oat/ soybean/ oat/ soybean. Plant height, insertion height of first pod, number of ramification of plant, number of pods per plant, soybean yield, mass of 100 grains were evaluated. It was conclude that rotation and succession of crops did not influence the agronomic performance of soybean for evaluated characteristics in this harvest.