Sereda L. Soybean productivity formation depending on sowing times and growth stimulators in conditions of central Ukrainian Forest-Steppe

The process of soybean productivity formation according to sowing terms and growth stimulators is taken as the rearch object. The aim of research was to determine dependences of soybean productivity, of formation on sowing terms and growth stimulators influences. The subject of research I factory of soybean productivity formation. The research methods are generally accepted. The influence of early-termed sowings and growth stimulators on field similarity and deceases level, soybean variety reactions in the process of photosynthetic and symbiotic formation and plants productivity was defined. The heaviest yield of "Kyivska 27" and "Podilska 1" seeds varieties was reached in conditions of optimal sowing term and usage of "Vitavaks 200ff" and "DG-75" together with rizotorphin and molybdenum ammonium. Negative correlative dependence between crude proteins contents and the level of seeds yield for such varieties as "Kyivska 27" and "Podilska 1" was discovered. Variety differences in dynamics of nitrogen acc umulation and crude protein contents in soybean seeds varieties were disclosed. Agriculture.