Abstract
The article assesses the effect of protective preparations of chemical and biological origin in the treatment of potato tubers and plants during the growing season in the climatic conditions of the Republic of Mari El. The results of the action of fungicides on the formation of potato yields are presented and the effect of the studied preparations on the leaf surface area during the growing season, as well as the effect of chemical preparations in the fight against diseases in the treatment of tubers before planting and plants during the growing season. The use of the fungicide Celest Top and the treatment of plants during vegetation with chemicals increased the leaf surface area during the flowering phase to 40 thousand m2/ ha. In this variant, thanks to chemical fungicides, there were the highest indicators of germination density, phytometric indicators of resistance to the most common diseases, which made it possible to increase and maintain the maximum leaf surface area, thanks to which the yield of potato tuber increased by 4.2%. The purpose of the study is to study the influence of various disease protection systems on potato yield in the conditions of the Republic of Mari El.
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