Chayka V. Agrochemical efficiency of mineral fertilizers applied on white cabbage hybrids of different maturity types.

Agrochemical processes in dark-gray podzolic soil, physiological and biochemical processes in plants, the way of its changes during mineral fertilizers application on white cabbage hybrids of different maturity types are the objects of the investigation. The target of the trials - to estimate optimal rates of mineral fertilizers, including new combinated fertilizer "Harmony" (N:P:K - 12:16:20) on white cabbage hybrids of different maturity types in order to increase its yield and biological value of products if grown on dark-gray podzolic soils of the Northern Forest-Steppe zone of Ukraine. Methods: stationary field trial, laboratory (chemical and physical-chemical) methods of the investigation. Rational rates of combinated fertilizer "Harmony" in pre-sowing application and nitrate-potassium treatment during vegetation of early, medium and late maturity types of white cabbage hybrids were estimated. Mathematical models of productivity prognosis on the basis of the soil nutrients content under favorableand unfavorable season circum-stances were determined. The novelty of the work is in estimation of mineral fertilizers influence on dark-gray podzolic soil fertility, intensity of physiological and biological processes in plants, uptake of main nutrients and coefficients of fertilizer efficiency, yield and its quality by different maturity types of white cabbage hybrids if grown in the Northern Forest-Steppe zone of Ukraine. Area of the results application - agricultural production, horticulture.