AGROECONOMIC EFFICIENCY OF CORN CULTIVATION ON BARLEY STRAW ON THE SOD-PODZOLIC SANDY SOIL

Abstract

In researches on the sod-podzolic sandy soil the highest productivity of grain of corn of 108 c/ha was provided by N90+30P60K140 on the background of cattle manure in a dose of 60 t/ha and on the background of straw plowing with the liquid manure in a dose of 30 t/ha, thus profitability of straw plowing with liquid manure was 43% higher. The yield of crude protein made 966-978 kg/ha, starch - 66 c/ha, fodder units - 141,5-141,7 c/ha.The increase of productivity of corn grain from compensating dose of nitrogen in the form of a carbamide in variants with NPK was doubtful. In variants where straw is closed up without additional nitrogen, the profit was on the average 59 USD/ha higher in comparison with variant where its autumn application, without decrease grain productivity is provided. Decrease doses of phosphoric and potash fertilizers taking into account quantity of these elements released from barley straw plowed under corn, provided equal productivity, as well as full doses of NPK, at decrease expenses for fertilizers on 26USD/ha and increase profitability on 3-12%.