QUALITy o F soy BeAN seeds UNder TILLAGe w ITH dIFFereNT AMoUNTs oF w AsTe oF BLACK oATs, CoMMoN VeTCH ANd ForAGe TUrNIP

SUMMARY Adjusting the cover crop to the agricultural system is essential to reach success during a crop introduction, since this management can influence development, productivity and pro duced seeds quality. For the soybean cultivar CD 202, traditional, half, and double amounts of crop waste produced by black oats, and a consortium of black oat, common vetch and forage turnip, were evaluated. Tests comprised emergence (emergency speed index (ESI) and emergence rate (ER)), development, field productivity and quality of seeds (germination percentage, accelerated aging, purity, 100-seed weight, and water content). The experimental design was of split plots and the mean values were compared through the Scott-Knott test at a 5% significance level, totaling seven treatments with five rep lications each. No differences were found in germination percentage, water content, and final height of plants. Some treat ments differed in germination and waste use increased ESI; ER was superior for black oats and the best productivity was found under double amount of straw, on both cover crops. The seed strength decreased the under consortium, as shown by accelerated aging under the consortium. The purity of seeds was lower for black oats, decreasing with the least amount of crop waste. The 100-seed weight was lower with the double amount in oats; however, under the consortium the use of cover crop increased their weight. Thus, these species can be a good alternatives for soybean rotation on winter.