The purpose of the work is to study the effect and aftereffect of various types and rates of fertilizers on the change in the main fertility indicators of gray forest soil, as well as the productivity of the crop rotation link. The experiments were carried out in the grain-row unit (spring wheat - corn - spring wheat - peas) of a nine-field grain-herb-row crop rotation. The scheme of the experiment provided for the study of the following options: the calculated doses of mineral fertilizers for the formation of 4 t/ha of spring wheat grain, 40 t/ha of green mass of corn, 3 t/ha of pea grain, thermally treated granulated chicken manure in doses 1, 2, 3 t/ha, bedding manure in a dose equivalent to 3 t/ha of granulated droppings, buckwheat stubble green manure sown after harvesting winter rye. Under the influence of 1-2-3 t/ha of granulated chicken manure, the content of nitrogen (Nг) in the soil increased, compared with the control, by 73.1-81.1-112.0%, respectively, phosphorus (P2O5) - by 69.3- 79.8-91.3%, potassium (K2O) - by 90.3-140-188%; in the first year of aftereffect, Nг increased by 42.6-50.5-58.4%, P2O5- by 28.6-39.3-52.1%, K2O - by 56.1-84.8-170, 7%; in the second year of aftereffect Nг - by 13.1-21.3-44.0%, P2O5- by 40.1-51.2-74.4%, K2O - by 63.3-124.1-133.1 %. When manure was applied (42 t/ha), the amount of Nг, P2O5, K2O decreased, compared to 3 t/ha of granulated chicken manure, in the year of action, respectively, by 43.4, 19.0 and 42.2%, in the first year of aftereffect - by 16.6, 22.1, 48.1%. In the second year of the aftereffect, the values of these indicators when using manure and 3 t/ha of granulated chicken manure were equivalent. In the variant with the incorporation of buckwheat green manure, the content of mobile forms of macronutrients varied similarly to manure. Under the influence of 1, 2 and 3 t/ha of granulated chicken manure, the productivity of the crop rotation link increased, compared with the control, by 78.5, 104.3, 122.6%, respectively. The effect from the action and three years of aftereffect of 42 t/ha of manure was below the level of 3 t/ha of of granulated chicken manure by 12% (productivity growth 110.6%), buckwheat green manure - at the level of 1 t/ha of granulated chicken manure (productivity growth 80.6%) ... Depending on the type and norms of fertilizers, the profitability of production was 54 ... 196%
The influence of light gray forest soil cultivation systems and the use of fertilizers and biological product on the root supply and crop yields in the crop rotation link in the Volga-Vyatka region
