Study of sensitivity of crops to soil residues of herbicides Pivot, Fabian, Lazurit and Proponit

Abstract

Study of sensitivity of crops to soil residues of herbicides Pivot, Fabian, Lazurit and Proponit.
V.N. MOROKHOVETS, Z.V. BASAI, T.V. MOROKHOVETS, T.V. SHTERBOLOVA (Far Eastern Scientific Research
Institute of Plant Protection, Primorsky Krai, Kamen-Rybolov village).

In 2011–2016, the sensitivity of 13 crops to soil residues of herbicides Fabian, Pivot, Lazurit, Proponit, preserved
after their pre-emergence use in soybean crops in the consumption rates of 0.1 kg/ha, 0.8 l/ha, 1.0 kg/ha and 3.0 l/ha, respectively, was studied at the Far Eastern Scientific Research Institute of Plant Protection in the conditions of a planthouse in a series of experiments using the biological indication method. The seeds of the tested crops were sown into the soil from herbicide-treated plots, selected after soybean harvesting and/or in the spring of the next year before the start of field work. According to the decrease in height and crude aboveground mass of experimental plants in comparison with the control (without the use of herbicides), the toxicity of herbicide residues preserved in the soil for the tested crops was judged. Other signs of oppression and damage of test plants during their vegetation were recorded. The most sensitive of the tested cultures to the residual amounts of all studied herbicides was beet. Soil residues of Fabian, Pivot and Lazurit significantly oppressed carrot, buckwheat and cabbage. Cucumber also showed a high sensitivity to Pivot. Cultures susceptible to herbicide residues that were identified should be excluded from crop rotation with soy to
complete decomposition of drugs that have had a toxic effect on them. There was no negative after effect of Proponit on the test culture used in the experiments. There were no significant differences in phytotoxicity of herbicides with revealed aftereffect in variants with different terms of soil samples selection.