Zolotar Y. Soybean productivity depending on complex action of mineral and bacterial fertilizers in conditions of the northern Forest - steppe

Subject of inquiry - the growth, development and soybean seed yield formation process, its qualities depending on technological practices. The purpose of research was the establishment of regularities of the productivity element formation of early - ripening soybean cultivar depending on mineral fertilizers and various kinds of bacterial preparations and its growing technology improvement. The research methods are field, measuring and weight, laboratory, calculated and comparative, statistical and mathematical. According to the conditions of the northern Ukrainian Forest-Steppe, there are established the basic regularities of morphometric of their individual growth and development; details of seed yield and quality formation depending on agroecological factors under study what allowed to improve the given crop growing technology. The optimal parameters of the combination of mineral fertilizers and combined bacterial preparations in the soybean growing technology on gray forest soils are revealed. Thelevel of symbiotic nitrogen accumulation in soil and dynamics of phosphorus and potassium in it in soybean crops are determined. The improved technology of early - ripening soybean variety Kyivska 98 growing is recommended what ensures the obtaining of 7.0-8.0 hkg/ha seed with high qualitative indices in addition. The author's developments are introduced at the farms of the Kyiv region: LTD. Company"Pischanske" and the joint venture "Interagro-Skvyra" over a total area 100 ha. Sphere of application - the agroformations of the northern part of the Ukrainian Forest-Steppe.