Object - the relationship between the content of movable substances of nutritive elements in the soil, fertilizers and nutrition regime of grain sorghum on chornozem opodzolic in the Right-Bank Forest Steppe Zone of Ukraine. Purpose - to identify optimal and economically grounded rates and terms of mineral fertilizer application under grain sorghum to get stable high quality grain yields on chornozem opodzolic in the Right-Bank Forest Steppe Zone of Ukraine, and to determine the effect of desiccants on crop moisture. Methods - stationary and temporary trials, laboratory research, chemical and physical-chemical analysis of soil and crop samples, methods of statistical processing of information. Theoretical results - the effect of rates and terms of fertilizer application on nutrition soil regime of grain sorghum fields was determined; the effect of fertilizers on the development of grain sorghum yield and quality indices regarding their rates and terms of application were studied; the effect of reglon,mineral fertilizers and their combination with it on crop moisture was studied; the content dynamics and uptake of major nutrition elements from the soil and their use to form a yield unit, and also the coefficient of their use from fertilizers were defined; the calculations of economic, energy and agro-chemical efficiency of fertilizer application under grain sorghum were made, and the optimal preparation for its desiccation was determined. Practical results - the fertilization system for grain sorghum in the conditions of the Right-Bank Forest Steppe Zone of Ukraine, which makes it possible to get grain yield 9,0-10,0 t/h, was worked out. Using recommended fertilization system P90K90+N90-120 in spring and N200P200K200 in crop rotation, and also after manure 13,5t+N68P101K54 - N150P150K150 the compensation of 1kg NРК is 7,4-7,7 kg of grain. Novelty - for the first time for the conditions of the Right-Bank Forest Steppe Zone of Ukraine the effect of fertilizers as to their rates and terms of application onsome peculiarities of grain sorghum growth and development, the dynamics of nutrition element assimilation from the soil, its productivity and grain quality was identified. The system of its fertilization both in temporary and stationary (field) experiment on chornozem opodzolic was worked out; it implies the application of phosphorus and potassium in autumn under tillage and nitrogen - in spring under cultivation (based on soil diagnostics) and in crop rotation fertilizer content of 1 hectare is taken into account, which makes it possible to get stable yields with high compensation of yield increase per unit of the fertilizers applied. Degree of application - the main results of the researches were introduced in 2006 at SPA "Rise Agro" in Ryzhavka, Uman district, Cherkasy region on 138 hectares and at "Shpola-Agro-Industry Ltd." In Syhnayivka, Shpola district, Cherkasy region on 157 hectares. The field is agrochemistry and agricultural sciences.
