Subject: technological processes' optimization of soybean growing by establishing agroecological grounds for the application of biological, physical and chemical techniques, the peculiarities of grain yield formation and seed quality under insufficient moistening. Aim: to establish and substantiate the agroecological bases for the application of biological, physical and chemical means in soybean growing technology adapted to insufficient moistening conditions of the Forest-Steppe of Ukraine. Methods: field, calculating weighed, laboratory, chemical, biochemical, mathematical, comparative-calculated. Novelty: main cultural practice for soybean growing under insufficient moistening in the Forest-Steppe is worked out on the base of the study of a peculiar influence of agrometeorological conditions, of photosynthetic productivity dependent on moisture level, mineral and symbiotic nitrogen nutrition, plant stand, sowing dates influence on grain yield and methods of pre-sowing treatment of seeds on the formation of vegetative and generative organs depending on moisture conditions and temperature regimes, weedage regulation in plantings, cultivars and hybrids selection for row combined plantings, as a result of it main agricultural elements of the technology, which are of utmost importance in plant production, for obtaining high yield, are improved. Results: photosynthetic performance of soybean plantings and some peculiarities in crop yield formation depending on hydrothermal regime of insufficient moistening in the Forest-Steppe zone of Ukraine are established. The peculiarities of nitrogen consumption from mineral fertilizers and its fixation by symbiotic bacteria in soybean mineral nutrition are revealed. Such important agricultural elements of the technology as sowing dates and methods, seed sowing rates are developed. Row plantings of soybean and maize are recommended as an important reserve for a more effective use of a biochimatical potential of the zone. A possibility of application of physiologically-active chemicals like fumaran and abscinic acid and such physical factors as electromagnetic fields, radiation by special high pressure lamps and ultrasound generator for improving seed field emergence during preplant treatment of seeds. Fumaran application as a coldprotector is suggested. Application stage: scientific elaborations of the elements of soybean growing technology went through industrial testing and were introduced into agricultural production on the farms of Poltava Oblast during 1986-2006 ys, particularly, at the agrofirm "Mayak" of Kotelevskiy district, as well as in the leading managing units of the Centre for scientific provision of AIP in Kherson Oblast, Institute for agricultural of Southern region of UAAS in 2005-2007 ys, particularly in STOV "Dnipro" of Bilozirskyi district, that ensured an increase in yield level of soybeans by 0,38-0,69 t/ha and net profit by 371,57 hrvn/ha. 3 patents are got for a useful model. Application area: agricultural farms of all private forms.
