EVALUATION OF TANK MIXTURES OF HERBICIDES PROPONIT AND PLEDGE WHEN APPLIED BEFORE EMERGENCE OF SOYBEANS

Abstract

The work presents the results of testing tank mixtures of herbicides Proponit and Pledge applied in different doses to soybean crops during preemergence Treatment. The tests were carried out in Primorsky territory by standard methods in the form of the plot experiment in the trial field with brown meadow podzolized soils (by mechanical composition characterized as medium clay, content of humus 3.8%, labile phosphorus and exchange potassium in the soil 16 and 120 mg/kg respectively, PH 5.3). Hydrothermal conditions during the experiment were favorable for the implementation of the herbicidal potential of soil preparations. Trial tank mixtures showed high herbicidal activity against annual grass weeds (Echinochloa crusgalli, Setaria spp), annual dicotyledonous species (Ambrosia artemisiifolia, Acalypha australis, Abutilon theophrasti, Elsholtzia pseudocristata, Chenopodium album), Commelina communis and certain perennial dicotyledonous weeds. The use of mixtures of Proponit and Pledge in higher doses contributed to an increase in protective action and increase in the total herbicidal activity of preparations. The highest yield of soybean in the experiment, 2.41 t/ha, which exceeded the control value by 3.5 times, was achieved in the variant of the soil treatment with a mixture of herbicides in the maximum recommended rates (Proponit 3.0 l/ ha + Pledge 0.12 kg/ha). The economic efficiency of chemical weeding amounted to 39.0 thousand rubles/ha. Thus, in the conditions of soya crops contamination mainly by sensitive annual weed species and with optimal soil moisture, preemergence use of Proponit + Pledge tank mixtures was sufficient for reliable protection of soybean crops and eliminated the need for foliar herbicides.