Evaluation of the effectiveness of tank mixtures of soil and foliar herbicides in soybean crops in Primorsky Krai

The Far Eastern Research Institute of Plant Protection - Branch of Federal State Budget Scientific Institution "Federal Scientific Center of Agricultural Biotechnology of the Far East named after A.K. Chaiki", 42a, st. Mira, s. Kamen-Rybolov, Khankaisky district, Primorsky Krai, 692684, Russia

^* Corresponding author: dalniizr@mail.ru

Abstract

The biological activity and economic efficiency of a combination of soil herbicides Zenkor Ultra + Dual Gold and sequential application of tank mixtures of Flex, Fusilade Forte, Eventus and Vidblok Plus preparations on their background were studied in soybean crops in Primorsky Krai of the Russian Federation. The experiments were conducted in 2022 and 2023. It was found that the tank mixture Zenkor Ultra 0.25 l/ha + Dual Gold 0.65 l/ha most effectively suppresses all annual cereal species and Asiatic dayflower. The mixture Zenkor Ultra 0.5 l/ha + Dual Gold 1.5 l/ha, in addition to weed cereals and Asiatic dayflower, also reliably controls common ragweed and common lambsguarter, reducing their wet aboveground weight by 77–99%; less effectively – Asian copperleaf (69–79%). At reduced application rates, the tank mixture of soil preparations was ineffective against these species, but showed a good effect on crested elsholtzia, bunges smartweed, common mugwort and curly dock, which were present in the field in 2023. The application of tank mixtures and combinations of foliar herbicides against the background of soil preparations contributed to increased control of dicotyledonous weed species and ensured an increase in yield by 1.21–2.01 t/ha compared to the control and by 0.67–1.22 t/ha more compared to the seed yield obtained as a result of using only soil preparations.