The paper presents the results of field research, conducted in 2021–2023. The research was aimed at creating the efficient space structure of soybean while sowing. This structure was based on seeding method and rate. It has been done to increase the seed production of new varieties for accelerated variety renewal as well as for variety changing. The field experiments were conducted at alluvial chernozem-like soil on the experimental field of All-Russia Scientific Research Institute of Soyabean with the fairly beneficial weather conditions for soybean. The experiment scheme included row sowing with 15 cm row spacing and 45 wide-space sowing of Topaz variety. It was an ultra-early ripening variety with the seed rating from 400 to 600 thousand viable seeds per hectare, respectively. The traditional row sowing of viable seeds with the seed rating 400 thousand per hectare increased the variety crop production up to 2.8 t/ha proving the soybean seeds production at 2.3 t/ha. The wide-space sowing with the seed rating 600 thousand viable seeds per hectare produced the crop yield over 3t/ha promoting the soybean seed production at 2.42 t/ha. As the result, it has been detected that combination this seeding method induced the efficient space structure of plants within the soybean variety agrocenosis. While increasing the variety seed productivity up to 18–27%, the bioproductivity of cenosis was increased at 26%.

Rafalskiy Sergey V., Rafalskaya Natalia B.

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