Scientific Journal of KubSAU

In the article, we have revealed the efficiency of sown using of fertilizers, the methods and the doses of additional fertilizing on different maize subspecies growing on the leached black soil of Northern Ciscaucasia which are based on studies in central part of the Kras-nodar region in 2008-2010. We have also given the scientifically-based references of increasing productiv-ity of maize

The research about effectiveness of ammonium nitrate with sowing and in phase of corn 5-6 leaves and row spacing cultivation before straw mulching was done in 2011-2013. The scheme of trial included the variants with straw mulching and without it. The variants without fertilizers and with small doses of them on background without mulching gave higher yield of cobs milk maturity then with mulching. But variants with maximum fertilizers (with sowing N30 and in phase of corn 5-6 leaves N30) gave maximum yield of cobs milk maturity 16,4 t/ha that is higher then similar variant without mulching for 1,7 t/ha. These results were confirmed by analysis of characters of growth and development of corn plants, productivity, and economic effectiveness. Therefore, net profit on variant with fertilizers with sowing N30 and additional fertilizing N30 on background of straw mulching increased for 75490 rubles for 1 ha in comparison with similar variant without mulching. The profitability on the best variant was 335 %