MINERAL NUTRITION AND PRODUCTIVITY OF CORN FOR GRAIN UNDER CONDITIONS OF SALTED MEADOW-SIEROZEMIE SOILS OF SCHAULDERSKY IRRIGATED ARRAY
The article presents the results of soil-agrochemical surveys of 42 peasant farms in the Shaulder massif of the Turkestan region. The database of the information system of the object of study included geographically linked (longitude, latitude) analytical data on the content of humus, the degree of salinization of soils, the content of mobile forms of phosphorus and potassium, and the pH value of 225 sampling points. It was revealed that out of 500 hectares of the surveyed territory of 42 peasant farms, 495.6 hectares or 99.1 % of the soils have a very low content of humus and easily hydrolyzed nitrogen, motley phosphorus and potassium (from low to high content). It has been established that the use of fertilizers is on saline soils is an important factor in increasing soil fertility and crop productivity in these farms. In this case, nitrogen fertilizers are most effective while phosphorus and potassium, fertilizers ensured their more economical use and increase the yield of corn for grain, depending of salinity (within 11,4-40,0 %). When differential doses of fertilizers are applied across the fields, taking into account their availability in the soil, their utilization coefficient increases and losses are reduced. The use of innovative technologies for preserving soil fertility and corn productivity on grain in the fields of peasant farms with an optimal fertilizer system, taking into account the provision of soil with mineral nutrition elements.