The results of research on the effect of biopreparations on soybean plants in the Primorsky Territory are presented. The experiment was conducted in 2020, 2021 under the conditions of a plot experiment. The preparations were studied on soybean plants of the Primorskaya 86 variety. The objects of research are microbiological preparation Biocomposite-correct and organomineral fertilizer Biostim Start. The experiment scheme included the following variants: without treatment (control); treatment of seeds with Biocomposite Correct; treatment of seeds and plants spraying with Biocomposite Correct; treatment of seeds with Biocomposite Correct + Biostim Start; treatment of seeds with Biocomposite Correct and Biostim Start + plants spraying with Biocomposite Correct. The use of biopreparations contributed to a decrease in the intensity of septoriosis development relative to the control (29.8%) by 5.2-6.8%. The maximum biological efficiency in the experiment (23.1%) was observed in the variant with treatment of soybean seeds with Biocomposite-correct. Complex treatment with Biocomposite-correct provided a reduction of downy mildew manifestations by 8.2%, the biological effectiveness was 37.8%. The biological products had a positive effect on the plant growth and development. The largest plant growth in the phase of full maturity was noted in the variant with Biocomposite Correct + Biostim Start + plant spraying with Biocomposite Correct (56.6 cm), in the control - 49.3 cm. When using biopreparations, the number of nodules exceeded the control by 17.4-34.1%, the number of leaves by 28.3-39.5%. The thousand-seed weight varied between 180.0-190.6 g in the experimental variants, and 157.5 g in the control. The seed weight per plant in the experimental variants was higher than the control by 41.3-70.6%. The studied preparations provided an increase in the yield in all the variants of the experiment. The biological yield was 3.3-3.7 t/ha with the yield of 2.5 t/ha in the control.

The results of research on the effect of crop protection agents on tomato and soybean crops under Primorye conditions are presented. The study of preparations was carried out on zoned varieties of tomato Novichok and soybean Primorskaya 86. The effectiveness of different combinations of biological preparations based on Bacillus subtilis strains Bactophyt, Gamair and growth regulators Zircon, Mival-Agro was evaluated. The preparations were used for seed treatment and spraying of vegetative plants. Complex treatment with Bactofit provided a 3.9% reduction of septoriosis manifestation on tomato, the biological efficiency was 22.1%. Growth regulator Mival-Agro (seed and plant treatment) provided 36.8% effectiveness against late blight. The highest tomato yield was observed with the treatment of seeds and plants with Gamair (20.0 t/ha) with an increase of 4.9 t/ha compared to the control. The maximum efficiency (29.7%) against septoriosis on soybeans was recorded in the variant Gamair + Mival-Agro. The biological efficacy against peronosporosis ranged from 21% (Gamair complex treatment) to 25.4% (Bactofit + Mival-Agro). The application of all preparations had a positive effect on the growth and development of soybean plants. The largest increase in plant height in the phase of full ripeness was noted in the variant with the use of Bactofit and Mival-Agro (73.1 cm), in the control - 61.8 cm. Thousand-kernel weight increased with certainty by 13.5 – 22.0% in comparison with the control (176.2 g) after the usage of biopreparations and growth-regulating chemicals. High yield was achieved in the Bachtophit + Mival Agro variant (2.7 t/ha), in comparison the control was 1.8 t/ha, the addition amounted to 0.9 t/ha.

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