N.S. Chetverikova
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Summary. The article summarizes the materials, which characterize the long-term dynamics of the main agrochemical indices of the fertility of arable chernozem. The materials of complete agrochemical inspection of arable soils in Ivnya district of Belgorod region, which is a part of CCR, were used. The soil cover in the region is mainly represented by typical and leached chernozems. The dynamics of organic and mineral fertilizers utilization was analyzed. High positive correlation (r = 0.96) between mineral fertilizer application and tillage productivity was established. As a result of long-term agricultural use arable soils in forest-steppe zone acidify. During the period of 1976-2010 the portion of acid arable soils increased from 35.4 to78.4 %, including the portion of medium acid soil – from 1.9 to 36.9 %. The weighted mean value of pHKCl decreased from 5.6 to 5.2. According to the results of inspection in 2010 the weighted mean content of organic matter in arable layer was 5.4. %, the content of easy hydrolysable nitrogen was 174 mg/kg. During 1964-1995 the weighted mean content of mobile forms of potassium in arable soils increased from 76 to 115 mg/kg, and the content of mobile forms of phosphorus grew from 56 to 160 mg/kg. During 1995-2010 the value of these indices decreased by 7.8 and 23.1 %, correspondingly.
Keywords: agrochemical inspection, soil acidity, soil organic matter, organic fertilizers, mobile forms of phosphorus and potassium, chernozem.