Optimization methods of phosphorus regime of disturbed lands in the Far North

Abstract

The results of the studies of the optimization methods of phosphorus regime of disturbed lands in the Far North are presented. In technogenic disturbed soils, the total phosphorus content is very low-0.071-0.087% (reclaimed soils in the area of Bovanenkovo) and 0.03-0.06% (sand in the area of Salekhard). Down the profile its content increases to 0.3-0.5% in accordance with the gross reserves varies and the content of available forms of phosphorus. By the end of the growing season, there is a tendency to reduce the content of mobile phosphorus, especially where high rates of fertilizers were introduced. To preserve the fertility of recultivated soils at a minimum level, it is necessary to periodically apply mineral fertilizers in the form of dressings. The main reserves of phosphorus are consumed by perennial grasses for two years. In subsequent years, the content of available phosphorus is reduced from 1.5 to 2.0 times. A crucial role in providing perennial grasses available phosphorus are mineral fertilizers and peat beauty. Phosphorus intake into plants was particularly intense in the early stages of development (germination– earing (tasseling)), reaching a maximum in the interphase period earing (tasseling) – flowering, and decreased during flowering – the beginning of maturation. Increasing the dose of phosphorus fertilizers by 60 kg, the active substance stimulated its consumption in the phase of earing (tasseling)–flowering.