Agricultural technologies influence on the phytosanitary condition and productivity of crops

The purpose of research is to establish the most effective technologies for cultivating crops in forage crop rotation based on their phytosanitary condition and productivity. The objects of research were crops of forage crops in crop rotation (annual and perennial grasses, grain crops, corn), cultivated using five technologies that differ in the intensity of nutrition backgrounds and the use of pesticides (extensive - control, intensive, high-intensity, organic, biologized). Research was conducted in 2018-2021 in a joint field experiment of the Yaroslavl Scientific Research Institute of livestock breeding and forage production - a branch of the Federal State Budget Scientific Institution “Federal Williams Research Center of Forage Production and Agroecology” and the Yaroslavl State Agrarian University to study phytosanitary indicators (the number and weight of weeds, potential contamination of the soil with their reproductive organs, the spread of diseases and the number of insect pests) and the productivity of cultivated crops using generally accepted methods. The research results made it possible to recommend perennial grasses for up to 3 years of use in fodder crop rotations in order to improve the phytosanitary condition of crops and corn in order to obtain high fodder productivity of the crop rotation (over 5 800 fodder units per 1 ha). For the cultivation of crops in this crop rotation, the use of organic technology using only organic fertilizers (cereal straw, manure at a rate of 60 t/ha for corn, green manure) is quite justified, since it helped reduce the abundance of weeds by 13.3-15.4 %, minimized the prevalence of diseases of grass and corn, reduced the number of insect pests by 9.7 % while obtaining an average increase in productivity of 26.8 % compared to the control and the absence of a significant reduction in comparison with intensive technologies while increasing the quality indicators of the crop and economic efficiency (profitability level - 132.9 %, return on additional costs - 4.86).