The Seed Yield of Soybean Cultivars and Their Quantity Depending on Sowing Term

The successful production of soybean seeds is dependent on the sowing date, because every outside optimal time contributes to losses yield. aim study was identify response date chosen cultivars by evaluation length vegetation period, yield level, its parameters and seed chemical composition. A field experiment conducted in years 2016–2019 at Agricultural Experimental Station Grabów (Masovian Voivodeship, Poland) belonging Institute Soil Science Plant Cultivation—State Research Puławy. Soybean (four 2016–2017 six 2018–2019) listed EU Common Catalogue with various earliness were included experiment. Three different dates used: I—early, II—medium III—delayed. two-factor carried out using a split-plot design Luvisol soil sandy loam texture classes, four replications. inoculated bacterial culture Nitragina containing strains Bradyrhizobium japonicum. After reaching full maturity, most important morphological traits 10 plants components: number pods per plant pod provided. harvest, (kg hectare 14% moisture), 1000-seed weight determined. showed that favourable weather conditions during growing season best yields obtained for sown second while year unfavourable conditions, had no significant effect yields. Seeds grown under limited rainfall contained about 9% more protein than those agroecological conditions. delay 20 days positively influenced accumulation seeds.