Radko T. Agroecological essesment of potato growing under the Ukraine's Polissya short-term crop rotation.

The thesis deals with the solutions of the actual problem - the development of agroecological basis of potato growing on the light-grey forest soil under the Ukraine's Polissya short-term crop rotation. It has been established, that the optimum degree of crop rotation potato saturation is 25% in comparison with saturation of 33,3% and 50%, that has created the favorable conditions for plant growing, yielding capacity formation and supported the agroecosystem ecological resistant. The agroecological and biodiagnostic soil assessment depending on the fertilization, the surveyed cenosis and cellulose soil activity. The total biological soil activity and mesofauna quantity has been established. The thesis proves that the highest yielding capacity of ecologically pure bulbs - 197-224 c/ha can be got while combined applicating straw - 3 t/ha, ciderates, manure - 10 t/ha of crop rotating area with moderate norms of mineral fertilizers - N30-45 P35-50 K40-50. The intensity of nutriment balance goes to 138,5-149,5%. The application of such a fertilization system reduced the bulb disease, increased their preservation and supplied agrophytocenosis ecological equilibrium. Key words: ecological resistant of agroecosystem, short-term crop rotation, potato, straw, ciderates, ecological and biodiagnostic assets of soil, yield capacity.