| Popis: |
In the conditions of a southwest part of CBR Russian Federation increase in content of alkaline-hydrolyzable and nitric nitrogen and also strengthening of nitrification ability of the soil in the black-soil typical is caused, mainly, by application of the increasing doses of mineral fertilizers, a manure after-action, use of long-term herbs in a crop rotation as predecessors of a winter wheat, and application, mostly, of plowing in the system of the main processing of the soil. The most noticeable variation of contents in the soil of alkaline-hydrolyzable nitrogen is noted for a layer of earth 20-50 cm, and nitrification ability of the soil – in a layer of 0-20 cm. The most significant increase in its contents in a layer of earth of 0-20 cm at a combination of mineral fertilizers and a manure is characteristic of nitric nitrogen, especially on plowing. The tendency to increase in content of nitrates in underlying layers is caused by application of the raised dose of mineral fertilizers under a winter wheat – N120P120K120 N60 (saturation of 1 hectare of the crop rotation area in a grain-grass-tilled crop rotation of N84P124K124 and in a grain-tilled crop rotation of N120P124K124) and an after-action for the fourth year of 40 and 80 ton/hectare of a manure (saturation of 8 and 16 ton/hectare). |
