Kozhukhar T. The Productivity of winter wheat depending on the norms of fertilizers and treatment of seed with nitrogen-fixings microorganisms in Right-bank Polesye of Ukraine.

The dissertation is devoted to the improvement of soft winter wheat growing technology with the aim of increasing productivity and improvement quality of grains and seeds. The above-mentioned improvement is achieved by interrelation of technological (mineral fertilization) and biological (before-sawing inoculation of seeds) factors. It is estimated that the efficiency of each structural elements of growing technology is increased by their combined use: yield addition of biological preparation use is 17-19 %, fertilizers - 48-60 %, fertilizers and before-sawing using seeds by biological preparation - 65-97 %. The results of the research have shown that the introduction of before-sawing inoculation of seeds in winter wheat growing technology is effective, ecologically safe and economically efficient of techology growing element, which permits to minimize the norms of miniral fertilizers on the dark-grey soil with ingreasing yield to 4,6-4,8 t/ha of grain II class of guality. The most economic and energy effective is grain growing of soft winter wheat Podolyanka on the basis of mineral fertilizers in the norms of N60P60K60+N30bush with before-sawing inoculation conduction by biological preparation on the basis of Azotobacter chrоococcum. Grain storage under unregulated conditions is the most effective during 6-9 mounths. It is not accompanied by significant worsening of physical and technological grain quality indicators. During storage of seeds need to provide in regulated conditions.