Abstract
The effect of a single instance of potassium fertilization at rates of 0, 70, 140, and 280 kg/ha on the potassium status and clay mineralogy was studied in a field experiment on ordinary chernozems. The content of exchangeable potassium determined by the Maslova method and the potassium potential vary with greatest reliability in response to increasing fertilizer rates. The content of easily exchangeable potassium and the potassium-buffering capacity are insignificantly affected by the application rate of potassium fertilizers. The chernozems under study without fertilization are characterized by a low supply of available potassium. When potassium fertilizers are applied at rates of 70 and 140 kg/ha, the soils pass into the category of unstable or high supply according to different gradation systems. The lower limit of the high or optimal supply category is reached only at the application of 280 kg/ha of potassium fertilizer. However, even in this case, chernozems are characterized by a low potassium supply according to the value of potassium potential and the content of nonexchangeable potassium. A single application of potassium fertilizers does not cause significant changes in the contents of illites in the clay fraction.
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Original Russian Text © D.N. Osipova, S.E. Ivanova, T.A. Sokolova, 2016, published in Vestnik Moskovskogo Universiteta. Pochvovedenie, 2016, No. 2, pp. 11–17.
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Osipova, D.N., Ivanova, S.E. & Sokolova, T.A. Potassium status and clay mineralogy in ordinary chernozems treated with different rates of potassium fertilizers. Moscow Univ. Soil Sci. Bull. 71, 51–56 (2016). https://doi.org/10.3103/S0147687416020046
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DOI: https://doi.org/10.3103/S0147687416020046