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Goal. To investigate the efficiency of microbial preparations in the cultivation of crops in crop rotation with different fertilizer systems. Methods. A field experiment, statistical. Results. The use of microbial preparations for pre-sowing inoculation of seeds of crops contributed to the growth of productivity of agricultural lands, however, the effectiveness of such measures depended on fertilizer systems. Bacterization increased the yield of potato, barley and pea at the cultivation of the crops on the background of low and medium mineral soil fertility, and especially for the combination of fertilizer with the effect and after-effect of use of 5 t/ha of wheat straw, and lupin as intermediate green manure. Preplant bacterization of winter wheat was effective in all studied doses of fertilizers and intensified on the background of the after-effect of straw and green manure. With the organic fertilizer system, the efficiency of microbial preparations depended on the kind of organic fertilizer. The low stimulating effect of the preparations was provided on the background of 5 t/ha of straw. In the year of the direct action of 40 t/ha of bedding manure of cattle, the efficiency of bacterization was leveled. In subsequent years (for the aftereffect of fertilizers) the growth of yields was reliable, but the smallest among the studied agricultural backgrounds. A high stimulating effect was observed when growing bacterized plants on green manure agricultural background and for the combination of straw with green manure biomass. Conclusions. The use of microbial preparations for pre-sowing bacterization of seeds is an effective agricultural measure in the techniques of cultivation of crops, but their influence on the productivity of agrocenoses depends on the fertilizer system.

The efficiency of microbial preparations in different systems of fertilizing crops