INFLUENCE OF SOIL-CLIMATIC CONDITIONS ON EFFICIENCY OF BIOPREPARATIONS AND NITROGEN FERTILIZERS FOR BARLEY CULTIVATION
It was discovered that there's a connection between the agrochemical properties of sod-podzolic soil, weather con- ditions of the growing season and the efficiency of biopreparations on spring barley. The study is based on the results of 43 field experiments. The mathematical model of the low-order of the forecast increase of the spring barley's grain yield during the process of the microbial preparations' inoculation based on associative rhizosphere diazotrophs has been developed. The use of this model will allow to identify the application efficiency of biologics, depending on the availability of soil humus, the reaction of the soil solution and meteorological conditions during the vegetation period. It has been established that the greatest spring barley's grain yield increase from the biopreparations' inoculation on the background of PK-fertilizer can be obtained when the humus content is equal 2.5-2.7%, the neutral soil environ- ment (pHKCl 6.1-6.7) and hydrothermal coefficient of Selyaninov (SCC) in May-June period 1.3-1.8.