An important element of soybean growing technology is the application of biological preparations made on the basis of active strains of legume bacteria. Seed inoculation is not only environmentally safe, but also an economically profitable method of growing soybean. This method improves the fixation of molecular nitrogen, improves the conditions for the growth and development of plants, their productivity and seed quality. Therefore, the study of the effect of biological preparations on the productivity of soybean varieties is a vital issue.
Field experiment was carried out during 2017–2018 on the experimental field of Central Ukrainian National Technical University. The soil of the experimental plots is the usual black humus soil. The following soybean varieties of the Institute of Steppe Agriculture of the National Academy of the Agrarian Sciences were studied: early-season Zolushka and mid-season Romashka. A generally accepted agro-technology for the growing area was used in the experiment. The biological preparations Rizogumin and Rizostim were studied.
It was established that the application of biological preparations had a positive effect on the field germination of soybean seeds, which increased by 2.0–2.5% (Zolushka variety) and by 2.2–2.4% (Romashka variety).
Use of inoculation of seeds increased the height of the plants in both varieties of soybean. Height of the plants of Zolushka soybean was 83–85 cm, and Romashka variety 94–97 cm.
The mass of Zolushka soybean plant was 55.2–58.4 g, and Romashka variety – 64.2-67.5 g. The inoculation of seeds increased the mass of Zolushka plant relative to the control sample by 3.0–3.2 g or 5–6 %; for the variety Romashka – by 2.7–3.3 g or 4–5 %.
Biological preparations Rizostim and Rizogumin significantly increased the number of plant nodules in both varieties. Therefore, during seed plumping, the number of nodules grew by 13–15 % for Zolushka, and by 16–17 % for Romashka.
The high productivity of soybean varieties was provided by the biological preparation Rizostim – 2.02 c/ha (Zolushka variety) and 2.31 c/ha (Romashka variety). The yield increase relative to the control sample was 9 and 10 %, correspondently.
soybean, biological preparation, mass of plants, plant height, number of nodules, productivity.