IMPACT OF MINERAL FERTILIZER NORMS TO AGROCHEMICAL PROPERTIES OF SOILS, NUTRIENT CONTENT OF WINTER WHEAT AND ITS YIELD
The article provides information on the study of the agrochemical properties of irrigated gray-brown meadow soils, the chemical composition of winter wheat, as well as the effect of fertilizers to its yield. Irrigated gray-brown meadow soils of the experiment are light loamy in mechanical composition, slightly saline with chloride-sulphate type. The humus content is not more than 1,0?%, the soils are moderately supplied with mobile nitrogen, phosphorus and potassium. The content of nitrogen and potassium in the soils of the fertilized variants was insignificant due to their accumulation in the organs of winter wheat of the variety «Polovchanka». In the soils under the winter wheat of the «Hosildor» variety, on the fertilized variants, compared with the control, there was more phosphorus than nitrogen and potassium and, accordingly, its absorption by the plant was also higher. The rates and mineral fertilizer ratios affected the grain yield. It has studied the feature of the species of wheat in depend of fertilizer, agricultural technology and nutrients. Rather sympathetic on fertilizers, steady on winter conditions and fruitful there was a grade of «Polovchanka». The variety «Polovchanka», in comparison with the «Hosildor» variety, turned out to be more demanding of fertilizers and the highest yield of the wheat variety «Polovchanka» at 70,17 centers/ha obtained by applying fertilizer in the norm of N250P200K200 kg/ha, with the «Hosyldor» variety, the highest yield of 62,44 centers/ha was obtained when applying mineral fertilizer in the norm of N200P200K200 kg/ha.