THE IMPACT OF MINERAL FERTILIZER AND STRAW APPLICATION TOGETHER WITH SEED INOCULATION ON RHIZOSPHERE MICROFLORA OF WINTER WHEAT AND ITS YIELDS
Inoculation of winter wheat seeds with Rhizoagrin - a biological product of comprehensive action on the background of N<sub>15</sub>P<sub>23</sub> separately and in combination with straw had positive effect on the biological properties of meadow chernozem soil, stimulated an increase in the number of soil microflora. The positive effect of fertilizers and inoculation of winter wheat seeds of a new promising variety Priirtyshskaya on soil microflora and crop productivity was evidenced by the close correlation between the total number of microorganisms in the rhizosphere, the number of nitrification agents, bacteria on meat-and-peptone agar, oligonitrophilic bacteria, phosphate mobilizing bacteria and crop yields (r = 0.71-0.93). The transformation coefficient of organic compounds in the variants with fertilizers was 96 units as compared to 52-81 units in the control. The highest grain yield of winter wheat (4.48-5.24 t ha) was obtained in the variant with the use of mineral fertilizers N<sub>15</sub>P<sub>23</sub> and straw.