Internal and external environments of Ukrainian private agrarian enterprise activities were analyzed in the article. The necessity of state assistance in income support of agricultural enterprises was substantiated. Economic mechanism of such income support through redistribution of excess profit of high profitable branches of national economy in favor of agriculture was proposed. Methodological and methodical approaches on improvement of interbranch economic relations in agroindustrial complex were elaborated. These approaches combined interests of both agrarian and processing enterprises, and oriented them towards receiving maximal final results.