Efficiency of different tillage, fertilization systems under short crop rotation and their influence on phytosanitary condition of agrocenoses

The main restraining factor of the widespread introduction of minimization of mechanical tillage into the domestic agricultural practice was and remains the problem of deterioration of the phytosanitary state of agrophytocenoses and the soil environment. Intensive use of pesticides, especially in violation of the regulations of their use, does not solve the problem, and often, on the contrary, aggravates it. Ukraine ranks sixth-seventh in the world in terms of contamination of plant products with pesticide residues. Agricultural practice proves that all pesticides are toxic to humans, and many of them also have mutagenic activity. They also cause great harm to living nature, suppressing the biological activity of soils, destroying pollinating insects, etc. Given this, the value of mechanical cultivation in regulating the phytosanitary state of agrobiocenoses and soil will increase, especially in ecological and organic agriculture. Research (2020– 2022) on the chernozems of the typical experimental field of Bila Ttserkva National Agrarian University established changes in the phytosanitary state of the agrobiocenoses of the field specialized grain five-field crop rotation and its productivity under different systems of the main cultivation of the chernozem soil of a typical low-humus medium loam in the Right Bank Forest Steppe of Ukraine, namely: shelf-disc the treatment has an advantage only in terms of significant limitation of dark brown spotting on winter wheat for sowing after buckwheat. In the remaining cases, it was significantly inferior to control. Indicators of the phytosanitary state of agrobiocenoses significantly worsen with constant soil disking. Discless tillage has an advantage only in terms of significant limitation of dark brown spotting on winter wheat after sowing after buckwheat. In the remaining cases, it was significantly inferior to control. Indicators of the phytosanitary state of agrobiocenoses significantly worsen with constant soil disking. The abundance of weeds is insignificantly lower under differentiated than shelf-disc cultivation. Fertilizer systems did not affect weediness, but worsened other indicators of phytosanitary status. With differentiated cultivation, the population of larvae of the winter weevil and the prevalence of helminth sporous root rot, powdery mildew and septoriosis of winter wheat after buckwheat, as well as the abundance of the meadow butterfly and wireworm in the agrophytocenosis of corn, are significantly reduced. Productivity of crop rotation is almost at the same level for shelf-disc and differentiated tillage. With chisel-disk and disk processing, it is significantly reduced. In a five-field field row crop rotation, differentiated tillage is recommended, in which deep (25–27 cm) plowing is performed only in one field under the row crop, where manure is applied, and in the rest of the fields, plowing and disc tillage to different depths, taking into account biological features of agricultural crops.