The productivity of corn for silage at integrated use of mineral fertilizers and lime under the conditions of Cis-Baikal area

The research objective was to study the influence of combined use of mineral fertilizers and lime on the productivity of corn and the change of agrochemical properties of gray forest soil in fruit changing crop rotation. The results of long-term researches on the influence of mineral fertilizers and lime on the productivity of corn for silage fruit changing crop rotation were presented: corn, barley + clover, clover, wheat. Positive influence of combined use of mineral fertilizers and lime on the efficiency of green material of corn was established. On average for four rotations (2001-2016) and also the beginning of the fifth (2017-2019) the increase of the productivity in comparison with the variant without introduction of mineral fertilizers and lime depending on the experiment variant made 3.4-8.3 (14-28 %) and 2.4-7.5 t/hectare (9-18 %) respectively. The greatest efficiency had joint effect of full mineral fertilizer (Ν60Ρ30K60) and lime where the crop of green material made 33.2 and 33.0 t/hectare respectively, being 11 and 11.1 t/hectare higher, than in the variant without fertilizers and lime. Using lime in the dose of 0.5 Hg in the fifth rotation of the crop rotation (2017) improved agrochemical properties of gray forest soil (pHsol - 5.8-6,3; Hg - 1,8-3,5 mg-equ. on 100 g of the soil; V - 89,6-95,3 %). It was shown that economic efficiency of nitrogen-potassium fertilizers against without lime above other options of the experiment. It was shown that economic efficiency of nitrogen-potassium fertilizers without lime had been higher than other test variants. The smallest prime cost of 1 t c. unit made 3 529.5 rub, the highest net income made 26 477 rub, profitability level - 155 %.