Fitometric index and yield of potatoes depending on fungicides used
Under field conditions, the effect of using biological and chemical substances that can stimulate the growth and development of cultivated plants and increase their resistance to unfavorable environmental factors was evaluated. In our research, we studied the possibility of optimizing the biological and chemical protection of fungicides and the timing of their use for preplant treatment of tubers and plant processing during the growing season for yield and quality of potatoes. In the process, it was established that preplant treatment of potato seed tubers and triple application of fungicides for the growing season had a significant impact on the emergence of potato seedlings, increased the number of main stems by one bush, which made it possible to get healthy, without damage to potato tubers. Preplant treatment of seed tubers had a significant impact on the emergence of seedlings of potato plants. In the variant, where potato tubers were treated with Selest Top insectofungicide, field germination increased by 1.0 % in Bellaroza variety and by 1.2 % in Gala variety, compared with the control variant. The highest yield of potato tubers of 174 c / ha, was obtained in variant no. 2 with preplant tuber treatment with Selest Top drug and triple chemical treatment of plants with fungicides (Metaxil - 2.5 kg/ha, Ridomil - 2.5 kg/ha, Ordan - 2.5 kg/ha) during the growing season. When growing potatoes of Gala variety on variant no.2, the potato crop was formed at the level of 164 C/ha, or 14.6 % more than the control variant. Preplant treatment of tubers and plant processing was an indispensable element of potato cultivation technology, because the productivity of this crop can be reduced by 1.5-2 times when growing without protective measures.