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The effect of different fertilizing systems on the content of humus in gray forest soils of the Opolie region has been studied during three cycles of eight and seven course crop rotations. At the application of phosphorus-potassium fertilizers and without fertilization, the content of humus in the plow layer has decreased by 0.02% annually in the first rotation cycle and by 0.011% in the second and third cycles. In the first cycle, the addition of 1 t of litter manure and 1 kg of nitrogen increased the humus content by 55 and 9.8 kg, respectively; in the second and third cycles, the humus increment due to the organic and mineral fertilizers decreased by 2-3 times.Keywords: mineral, organic, and organic mineral fertilizing systems; content and reserve of humus, link and cycle of crop rotation

The aim of the research was to study the effect of fresh chicken droppings on the dynamics of the physical-chemical and agrochemical properties of sod-podzolic soil and the yield of grain crops. In the sod-podzolic light loamy soil of the Yaroslavl region in the layer of 0-0.20 m in May, fresh chicken droppings were embedded at the dose of 120 t/ha. By autumn, in the 0-0.40 m layer of pHKc1 increased from 4.53-4.99 to 5.38-7.09, the content of mobile phosphorus and exchangeable potassium increased by 2.0-2.4 times, nitrate and ammonium nitrogen - 3-5 times. The content of nitrates in the soil has exceeded the Maximum Allowable Concentration level. The grain yield of the spring wheat studied varieties, triticale and barley varied from 6.7 to 9.5 t/ha, chaffy oats - from 5.7 to 5.9, hulless oats - from 4.4 to 4.6 t/ha. At the beginning of the growing season of crops in the 0-0.40 m layer, the stocks of nitrate nitrogen were close to the stocks of the autumn observation period of 2019, and ammonium nitrogen decreased by 285 kg/ha.