Effect of the Sowing Season and Climatic Conditions on Weeds in Soybean Cro

Weed competition for water, light and nutrients can cause yield losses of up to 80-90% if effective weed reduction measures are not taken in the soybean crop. Research on the influence of sowing time on the degree of weeding of soybeans was carried out at the Turda Agricultural Research and Development Station, during 2021- 2023. The dominant dicotyledonous species were Chenopodium album, Hibiscus trionum, Polygonum convolvulus, Xanthium strumarium, and for the monocotyledonous species Setaria glauca and Echinochloa crus-galli were identified, both in the first and the second sowing season, the difference between the two sowing season being given by the total number of species and the number of weeds identified per plot. The soybean crop was removed from weeds by the two swaths, and the plant was re-weeded with the same species as in the spring after the flowering period. Weeds that appeared during the latter part of the soybean growing season did not cause any significant harm to the crop. The number of weeds per plot and soybean yield were influenced by the sowing season and climatic conditions. The best outcome was achieved when soybeans were sown during the first season.