Aim: To improve systems for protecting soybean varieties from pests under irrigated conditions. Methods: A set of general scientific methods and approaches of empirical and theoretical knowledge was applied: abstract-logical, statistical, modeling, generalization; two-factor field experiment. Results: The effectiveness of protecting soybean varieties from harmful organisms when using biological and chemical preparations with drip surface irrigation in the Steppe of Ukraine was established. The Diona variety demonstrated the highest yield during the third sowing period “20 May” with a seed yield reaching 3.78 t/ha. In the variant with the Danai variety, the highest grain yield of 4.04 t/ha was recorded during the third sowing period, the Svyatogor variety showed the highest grain yield during the third sowing date “20 May” sowing period -4.17 t/ha. Conclusion: Chemical plant protection was more effective than biological methods: when growing the Danai variety, the additional grain yield relative to the control plots was on average 0.39 t/ha (11.4%), and for the Diona and Svyatogor varieties -0.31 and 0.22 t/ha, or 8.3 and 5.5%, respectively. Biological protection of soybean varieties from harmful organisms was less effective than chemical protection, but it is advisable to use it in organic farming for the production of environmentally friendly products.
Yaroslav et al. (Mon,) studied this question.