PRODUCTIVITY OF CROP ROTATIONS DEPENDING ON SATURATION WITH WHEAT AND SUNFLOWER ON THE CHESTNUT SOILS OF THE STEPPE

The research was carried out to study the yields of wheat, oats and sunflower depending on the precursor and fertilizers and their effect on crop rotation productivity on chestnut soils of Western Siberia. The work was carried out in 2014-2019 in long-term stationary field experiments of the Kulunda Agricultural Academy. The productivity of 1 ha of arable land depended mainly (86.2%) on crop rotation, increasing from 0.47...0.54 thousand grain units in agrocenoses without sunflower to 1.11 thousand grain units in the presence of 50% of sunflower, the payback of nitrogen fertilizers simultaneously increased from 3.67...4.00 to 9.00 grain units/kg.