Productivity and chemical composition of food-type soybeans sown on different dates
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Universidade Estadual de Maringá
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The objective of this study was to investigat e the effect of different sowing dates on the yield, 100-grain weight, oil, protein and isoflavone contents of food-type soyb ean breeding lines UEL 110, UEL 115 and UEL 123 and a cultivar BRS 257. The material s were seeded on four sowing dates, and the experiment was conducted in a rand omized block design with four re plications. The productivity and 100- grain weight varied with the sowing dates and soyb ean genotypes. The protein content ranged from 36.40 to 42.44%, and the oil content ranged from 18.29 to 22.71%. No significant interaction was found between the genotype and sowing dates for the protein content. The isoflavone content also varied with the sowing dates and soybean genotypes. The cultivar BRS 257 had the highest isoflavone content, including the β - glucoside, malonyl glucoside and aglycones forms. The different sowing dates influenced the productivity, 100-grain weight, oil and protein cont ent and isoflavone leve ls. Higher temperatures and lower rainfall during the grain filling decreased the productivity and isoflavone content and increased the protein content. For all sowing dates, the BRS 257 soybean food-type cultivar showed the highest isoflavone content, indicating that the effect of genotype is more important.
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