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The objective of the work was to evidence the effects of the species of ground cover in the winter period on the nutraceutical quality of the grains of the soybean cultivars. The experiment was carried out in a randomized complete block experimental design organized in a factorial scheme with five soybean cultivars (50i52 RSF IPRO, 55I57RSF IPRO, DM 57i52 IPRO, BMX Lança 58i60 RSF IPRO, M 5838 IPRO) versus four soil coverings [linseed, white oat, wheat and pasture (ryegrass)], with treatments arranged in four replications, totaling 80 experimental units. In the useful area of each experimental unit, 10 plants were randomly harvested per experimental unit, where crude protein (CP, %), ether stratum (ES, %), mineral material (MM, %), oil (OIL, %), crude fiber (CF, %), palmitic acid (PA, %), stearic acid (SA, %), oleic acid (OA, %), linoleic acid (LA, %), linolenic acid (LNA, %), and percentage of greenish grains (GG, %) were analyzed. Soil coverings influence the nutritional composition of soybean grains, and linseed, white oat, and wheat are responsible for stability and the expression of the percentage of protein and oil in the grains. Based on the WASSBY index, the DM 57i52 genotype presents the best expression ideotype of nutraceutical characters. [ABSTRACT FROM AUTHOR]

This research determined the adaptability and stability of soybean yield for organic systems in different environments. Grain yield data (GY, kg ha-1) from experiments with six soybean genotypes evaluated in six environments in Brazil and one environment in Paraguay were used. The experimental design used was randomized blocks, organized in an incomplete factorial scheme, with six environments in Brazil (Toledo-PR, Palotina-PR, Mangueirinha-PR, Três Passos-RS, Passo Fundo-RS, Major Vieira-SC) and one in Paraguay (Bela Vista do Norte-PY) with six soybean genotypes (BRS 284, BRS 391, BRS 511, BRS 523, BRS 525, BRS 535) arranged in four replications per environment. BRS 511 genotype was characterized by high average grain yield and stability by the AMMI method. BRS 284 genotype was identified as the ideal genotype in the GGE biplot method. WAASBY and BLUP index selected BRS511 and BRS284 genotypes. [ABSTRACT FROM AUTHOR]