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The purpose. To probe influence of different fertilizer systems of soya bean on nutritive regime of grey forest soils. Methods. Field experiments with soya bean were spent on grey forest soils by B.A. Dospehov's technique with observance of demands GOST 10106-87 «Field experiments field with fertilizers. Order of their holding». Size of sowing plot was 25-30 m 2 , frequency-4-times. Phosphoric and potassium fertilizers were deposited in the autumn under the basic soil cultivation, nitrogenous-in the spring during presowing cultivation. During vegetative period of soya bean in field experiments they carried out observation, account and laboratory researches. Laboratory analyses of soil and plants were realized according to conventional techniques. Economic efficiency of growing soya bean was determined by technique of NSC «Institute of economy of NAAS» (1999). Mathematical-statistical analysis of the gained results was spent by B.A. Dospehov's method with the use of state-of-the-art computer programs. Results. Application of the designed organic-mineral fertilizer system of soya bean ensured optimum conditions for accumulation of vegetative mass by plants of soya bean, tall indexes of assimilatory surface of plants of soya bean in the phase of swelling of beans, promoted biological fixation of nitrogen. The given fertilizer system of soya bean improved fertility of grey forest soils of Right-bank forest-steppe of Ukraine. Ploughing under of collateral products of the predecessor, sowing green manure crops, importation of fertilizers in dose of N15P30K30, application of microelements, microbiological specimens, treatment of seeds and dabbling sowings by growth stimulants of plants ensured sufficient balance of nutrients of soil. Conclusions. Scientifically justified agroecological fertilizer system of soya bean for grey forest soils of Right-bank forest-steppe heightened their fertility: the content of hydrolyzable nitrogen was increased by 11,5 mg/kg, of mobile phosphorus-on 43, and of potassium-on 8 mg/kg. At use of such organicmineral fertilizer system positive balance of nutrients was formed: nitrogen-26,1 kg/hectare, phosphorus-53,7, potassium-49,8 kg/hectare of soil.

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