V.V. Okorkov
Vladimir Research Institute of Agriculture, Tsentralnaya, str., 3, v. Noviy, Suzdal District, Vladimir Region, 601261, Russia
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Summary. In the long-term stationary experiment the effect of fertilization systems on phosphorus and potassium regime of gray forest soil Vladimir opolye was studied. In the first rotation of the 8-field crop rotation linear regression equations were obtained on the basis of the analysis of the relationship of the content of mobile phosphorus and exchange potassium at the end of the rotation with the balance of these elements for the rotation. On the basis of these equations the input normals for phosphorus and potassium from fertilizers were calculated for the increase in the concentration of available forms of these nutrients by 10 mg/kg of soil. For phosphorus the standard of costs an average for 3 fields was 72 kg/ha P2O5, for potassium – 137 kg/ha K2O. In the second rotation of the 8-field crop rotation the relationship of the balance of these elements with changing of the content of their available forms during the rotation was studied. From the linear equations of the corresponding relationships it was calculated the cost standards for P2O5 and K2O from fertilizer and amount of restoration of the reserves of mobile phosphorus and exchange potassium for the rotation or the year. Average annual reducing ability of gray forest soil for mobile phosphorus was 33 kg/ha, in respect of the exchange potassium–51 kg/ha. Reducing ability of gray forest soil is stipulated both by the ability of root systems of cultivated crops to carry the nutrient elements from the subsoil layers in the upper humus horizons, and by high their stores in nearby reserves of the soil (labile organic matter, the presence of fine clay minerals of hydromicaceous and montmorillonite groups). Transformation of labile organic matter and ion-exchange and physicochemical processes significantly depend on weather conditions.
Keywords: gray forest soil, mobile phosphorus, exchange potassium, the balance of nutrient elements, equation of linear regression.
Author Details: V.V. Okorkov, Dr. Sc. (Agr.), Head of Division (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).
For citation: Okorkov V.V. Phosphorus and potassium regime of gray forest soil of Vladimir Opolye. Dostizheniya nauki i tekhniki APK. 2015. V. 29. No 8. pp. 28-31 (In Russ)