CURRENT STATE OF FERTILITY OF AGROCHERNOZEMSOF THE KRASNOYARSK FOREST STEPPE AS A RATIONAL LAND USE BASIS
The aim of research is to study the features of the soil cover and identify the state of fertility of agrochernozems that form within the agrolandscape of the Krasnoyarsk forest-steppe. The study was carried out on the territory of the Minderlinskoe Experimental Site of the Krasnoyarsk State Agrarian University, whose land use is located in the central part of the Krasnoyarsk forest-steppe (56°25'N and 92°53'E.). The experimental field is located on the Buzim-Minderla interfluve, which exceeds the river level by 40-70 m and is formed by ancient river terraces. The structure of the soil cover was studied on a plowed land with a total area of 9 hectares. When laying the sections, standard profile and morphological methods were used. The soil cover of the experimental site is represented by types of accumulative-humus soils - clay-illuvial agrochernozems and cryogenic-micellar agrochernozems, four subtypes and six species. It was found that agrochernozems are characterized by a light clayey coarse-silty granulometric composition without significant differentiation of profiles, which indicates the stability of the mineral mass of agrochernozems. The partitioned relief of the field determined the heterogeneity of the soils in terms of the humus state, which manifests itself in the variation of the humus content in the moun. AU from 6 to 11 %, their variability from thin to powerful species. In the composition of the soil-absorbing complex of agrosoils, Ca2 + dominates (19-28 meq/100 g) with an insignificant amount of Mg (2-5 meq/100 g). Agrochernozems are characterized by low hydrolytic acidity (0.3-5 mg-eq/100 g) and variation in the reaction of the soil solution in space from neutral to slightly alkaline (6.5-7.9 pH units). The results obtained indicate a high potential fertility of agrochernozems of the Krasnoyarsk forest-steppe. Materials reflecting the features of the soil cover and the state of soil fertility formed within the agricultural landscape are the basis for the introduction of resource-saving technologies in crop production.