Buslayeva N. Effect of various forms of phosphorous fertilizers on the fertility of gray forest soil and productivity of the short-term crop rotation

The thesis is devoted to the study of the influence of various forms and doses of phosphorous fertilizers of native and foreign origin on the changes in physical - chemical and agrochemical properties of the soil and crop productivity and quality in short-term crop rotation: maize for silage - winter wheat - spring barley. It was established the high agronomical effect of the application of different forms of phosphorous fertilizers alone and as a part of complete mineral fertilization both in moderate doses (P40-60) and in reserve (P360). It is allowed to gain the crop productivity of 4,5-5,0 t/ha of grain units. The ameliorative effect of native phosphorous fertilizers enriched with CaCO3 was determined. The agronomic and economic advisability of the systemic phosphoric fertilizer application in a short-term crop rotation as a component of complete mineral fertilization in moderate doses and the possibility of their application in reserve were substantiated. The necessity of phosphate rocksenrichment was defined.