УДК 631.416
Zakharova K.P., Fedorov A.N.
Abstract The article examines the mechanism of the impact of winter thaws, accompanied by repeated air temperature transitions through 0°C, on changes in potassium mobility in the arable soil horizon. It is demonstrated that "freezing-thawing" cycles (analogous to "wetting-drying" cycles) provoke non-exchangeable fixation of potassium ions by the crystal lattice of clay minerals of the silt fraction. As a result of this physicochemical process, readily available exchangeable potassium transforms into a tightly bound (non-exchangeable) state, temporarily inaccessible to the root systems of winter and early spring crops.
Keywords: thaws, arable horizon, soil potassium regime, exchangeable potassium, non-exchangeable potassium fixation, clay minerals, silt fraction, freezing-thawing, agrometeorology, agrochemistry
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