MAIN SOIL CULTIVATION IN CROP ROTATION WITH LUPIN FOR BRYANSK REGION CONDITION
Tests results have been got on gray forest soil in the South-West of the Non-Chernozem zone of Bryansk region in the stationary experiment in the All-Russian Research Institute of Lupine in 2015–2018. The aim of the test was to evaluate a hectare of crop rotation area of four field lupin crop rotation (winter wheat – bare oats – winter triticale – lupin) for production of feed and energy effectiveness at different technics of the main soil cultivation. The variant of dump ploughing with deep loosening once in four years for lupin has the highest productivity of feed and energy effectiveness per a hectare of crop rotation area. Each crop of the crop rotation has high indices of yield and quality of grain products at this way of soil cultivation. The tested four-field lupin crop rotation is more energetically stable at the variant of the main soil cultivation — traditional ploughing with deep loosening. Efficiency coefficient of the crop rotation was 3.15 in the first cycle and the coefficient of energy effectiveness was 2.15. The other variants of the main soil cultivation could be used too in multiform farms of a region to provide quite high profitability.