Soil reaction and potassium content in soil
2003
Veitiene, R. | Ozeraitiene, D. (Lithuanian Inst. of Agriculture, Vezaiciai (Lithuania). Vezaiciai Branch)
Plant available (mobile) potassium fraction in soil is the main source of plant nutrition. The acid moraine soils in Lithuania are rich in mobile potassium but its availability is dependent on other soil parameters, especially on soil reaction. Findings from fertilization trials suggest that crop rotation yield is dependent on the mobile potassium content in soil. In the present experiments, liming of acid soils resulted in decrease of the potassium content in topsoil from 400 mg kg*[-1) to 200 mg kg*[-1). During the soil acidification process, the mobile potassium content mostly increased when soil reaction reached pH 4.5-4.7, and decreased when soil reaction was pH 5.0-5.5 and higher. Under these conditions, potassium fertilizers did not increase the crop yield. Reduction of potassium content in soil was observed as a result of primary and periodical liming due to a higher removal of this element with the yield (rP2O5 = 0.57; rK2O = 0.72) and a more intensive leaching.
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