Humus condition under different systems of basic cultivation of dark gray forest soil

Studies, were conducted in a stationary experiment between 1988 and 2018 on dark gray forest heavy loam soil Scientific Research Institute of Agriculture for Northern Trans-Ural Region - Branch Federal State Institutions Centre Tyumen Siberian the Russian Academy Sciences. The aim study is to determine effect long-term (30 years) impact different systems basic cultivation soils grain crops humus content. Observations made according generally accepted methods during 6 rotations fallow crop rotation: bare fallow, winter rye, spring wheat, vetch, barley, unfolded time space. combined system tillage with alternation plowing no-tillage at 20-22 cm 5-pole steam rotation years), increased content 0-40 layer compared initial by 0.42%. main differentiated, without sowing, mouldboard provided general relatively favorable dynamics state soil. differentiated unswept period remained close condition. ?? ????????? ??????? ?????????? ?????? ????????? ?? 0,22% ??? ? ??????? 0,37?/?? ???. greatest loss 0.80% relation was surface treatment annual discing BDT-2,5 (heavy disc harrows) 10-12 or an average 1.33 t / ha.