INFLUENCE OF COPPER-CONTAINING AGROCHEMICAL ON GRAPE PRODUCTIVITY INDICATORS

Abstract

The studies were carried out to determine the biological effectiveness and fungicidal activity of the copper-containing agrochemical, as well as its effect on productivity of grape plants. The work was carried out in Rostov region in 2019-2021 on fruit-bearing grape plants of the Cabernet Sauvignon variety. The experiment scheme included the following options: without top dressing (control); copper-containing agrochemical (3-fold foliar feeding) at doses of 0.5, 1.0 and 1.5 l/ha. The first feeding was carried out after flowering, the second and third - 20 and 40 days after the first. Top dressing was carried out in the morning or evening hours in the absence of precipitation and gusts of wind. The consumption of the working solution is 1000 l/ha. The repetition of the experiment is three times. The most significant increase in the mass of bunches from one bush, compared with the control, was noted in the variant with a dose of 0.5 l/ha. A significant increase in the number of berries in a bunch and their weight was noted in the variants with top dressing at doses of 0.5 and 1.0 l/ha. A significant increase in the average weight of one berry, compared with the control, was noted in all variants of the experiment. The productivity of plants when using the drug at a dose of 1.5 l/ha was greater than in the control, but less than in other variants of the experiment. The most significant increase in the yield of grape bushes of the Cabernet Sauvignon variety (by 26.2%), compared with the control, was noted with top dressing at a dose of 0.5 l/ha. The concentration of sugars in the juice of berries at all doses of top dressing was significantly higher (by 0.7...1.0 g/100 cm2) than in the control. Fertilizing grape plants at doses of 0.5, 1.0, 1.5 l/ha increased the resistance of plants to mildew, compared with the control, especially at a dose of 1.5 l/ha. To increase the productivity of grape plants, it is advisable to use a copper-containing agrochemical at doses of 0.5 and 1.0 l/ha. To reduce the pesticide load against the background of protective treatments against mildew, it is recommended to use the drug at a dose of 1.5 l/ha.