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Potassium Desorption Studies on Calcareous Chernozem Soil (Mollisol)

Lasztity, B., Jaki, I., Biczok, G., Csatho, P.
Communications in soil science and plant analysis 2009 v.40 no.1-6 pp. 901-907
potassium, desorption, calcareous soils, ammonium acetate, extraction, NPK fertilizers, fertilizer application, nitrogen, phosphorus, fertilizer requirements, fractionation
Potassium (K) desorption studies were carried out on soil samples collected on 10 occasions during the main phenological phases of winter wheat grown on calcareous chernozem soil receiving buildup phosphorus (P)K fertilizer doses, using stationary flow of aqueous and ammonium acetate effluent solutions. The main results can be summarized as follows: 1) In the case of both aqueous and ammonium acetate extractants, K fertilization treatments, compared to treatments without K, significantly increased K extracted by the effluent solution. 2) For aqueous extractant, the rate of desorption was moderate in the first fraction and decreased continuously, whereas in the ammonium acetate extractant, the rate was rapid, and most of the total desorbed quantity was obtained in the first two fractions. 3) Seasonal dynamics were higher for the aqueous extractant, whereas significant changes occurred in the ammonium acetate extractant only at LSD10% level of probability. 4) There was a close significant correlation between the two effluents. 5) The desorption studies can prove the applicability of the method in characterizing nutrient intensity if it is further determined in calibration experiments.