Abstract and keywords
Abstract (English):
The paper presents the results of studying the acid regime of chernozem leached as a result of many years of use of organic, mineral fertilizers and ameliorant. The acidifying effect of mineral fertilizers has been established. So, when adding NPK, the pH value. decreases steadily by 0.5-1.0, and hydrolytic acidity increases to 6.9 mEq/100 g of soil. Stabilize this situation succeeds when adding calcium ameliorant.

Keywords:
leached chernozem, organic fertilizers, mineral fertilizers, defect, exchange acidity, hydrolytic acidity.
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References

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