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The paper presents the results of a short-term field experiment on the calcic chernozem. The effect of the use of humates on the content of exchangeable potassium in the soil during the cultivation of peas was studied. The results showed that the use of potassium humate in a tank mixture with and without insecticide has a positive effect on the content of this element. Foliar application of BIO-Don has virtually no effect on the K2O content and has a positive effect only in combination with the application of mineral fertilizer and the use of pesticides. Keywords: CALCIC CHERNOZEM, HUMIC PREPARATIONS, POTASSIUM HUMATE, BIO-DON, EXCHANGEABLE POTASSIUM, PEAS
Kartashev et al. (Fri,) studied this question.