The influence of sowing dates on the formation of the soybean seed yield in the conditions of the Central region of the Non-Chernozem zone

Relevance и methods. In the field experiment in conditions of sod-podzolic sandy loam soil Central region Non-Chernozem zone, influence four sowing periods (30.04; 05.05; 10.05; 15.05) on formation yield early-maturing soybean seeds variety Svetlayawas studied. Results. When at a later date, emergence seedlings was accelerated and faster development plants observed during growing season. Thus, when May 15, duration — germination period reduced by 6 days compared to April 30, season from maturation 4 days. sown soybeans reached harvest ripeness steadily third decade August, ripening goes September, which can lead unstable seeds, since temperature regime September does not meet requirements soybeans. The conducted studies have shown that high yields level 2.73 t/ha be obtained zone favorable weather conditions. most for seed this are created 5. decreasesuch indicators as 12.7%, plant survival 2.2%, height first inflorescence 2.6 cm biological 20.1% . At dates, there is also decrease 19.5–40.8% due (by 2.9–4.9%) weight 21.6–32.4%).