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able potassium acetate acetic acid adsorbed adsorption ammonium acetate amount of potassium appears assium available potassium available to plants CaCl CaCl2 calcium calcium chloride clay content clay fraction clay minerals colloids concentration considerable continuous cropping experiment correlation coefficients curves depth different soils Dunkirk effect equilibration equilibrium exchangeable potassium extracted potassium extracting solution factors fertility fixation forms of potassium gram soil HOAc Honeoye P366 horizons Ladino Lbs K/acre Livingston County soils Mardin NaOAc extracted NH4OAc non-exchangeable potassium nurse crop Odessa Ontario Ovid photometer plots potassium available potassium determinations potassium extracted potassium in soil potassium release potassium status potassium values quantities of potassium Reitemeier relationship release of potassium Sable salt solution saturated shown significant sodium soil horizons soil potassium soil profiles soil samples Soil Sci soil test soil type studies timothy rotation tion total potassium content vary