Sulfur in the soils of the Minusinsk forest-steppe of Krasnoyarsk region

In Minusinsk forest-steppe zone of Krasnoyarsk Region biogeochemical features of behavior of mobile sulfur in soils change depending on the orientation and intensity of soil-developing process, the water mode of the territory, the type of vegetation and economic activity of the man. In the soils of agricultural grounds the content of sulfur is subject to big fluctuations. The changes in the concentration of sulfur are caused by high diversity in the fertility of soils, unequal conditions of their soil formation and different maintenance of the element as a part of soil-making rocks. In a forest-steppe zone soils with low (88.8 %) and an average (9.6 %) the content of mobile sulfur prevails. The distinctions in the content of sulfur in chernozems, gray forest and medium sod-podzolic soil soils are connected with their unequal agrophysical and agrochemical properties and different technology of cultivation of crops. General regularity for different types and subtypes of soils is higher content of sulfur in the humic horizon and its reduction in a profile of soils. In 2016 in comparison with 1999 the content of sulfur in 0-20 cm layer decreased by 1.1-23.3 times. High removing of the element and low level of use of organic and sulfur-containing mineral fertilizers by the yield of crops are the main reasons for reduction of sulfur in soils. The brought manure doses (0.54-0.64 t/hectare) and mineral fertilizers (8.6-14.6 kg/hectare of a.m.) do not compensate the alienation of sulfur with the yield of crops. In agrocenosis of natural zone in 2007-2016 negative balance of sulfur (9.65 kg/hectare) is noted. The deficiency of mobile sulfur in soils leads to the reduction of its receipt in plants, the decrease in crops and deterioration of crop production. For the improvement of sulfuric food of crops it is necessary to increase the doses of introduction of organic and sulfur-containing mineral fertilizers in agriculture. The optimization of sulfuric plants nutrition taking into account agrochemical properties of zone soils will increase efficiency macro- and microfertilizers and will increase the efficiency of crops.