EXTRACTION METHODS AND ADSORPTION KINETICS OF POTASSIUM IN CALCAREOUS SOILS OF MULTAN

Understanding the dynamics of potassium (K) and its availability is fundamental in efficient use as an important nutrient. The objectives present study were to compare standard K extraction methods for extractable kinetics adsorption on five different textured soils. soils analyzed physico-chemical properties, contents adsorption. had variable soluble (8-52mg kg-1), exchangeable (13-215mg fixed (488-1836mg structural (2936-26362mg kg-1) total (3438-28517mg kg-1). Except K, amount forms was significantly (P?0.05) correlated with clay contents, electrical conductivity (EC), cation exchange capacity (CEC) calcium carbonate Different variated extracted Mehlich-III, ammonium acetate, AB-DTPA, chloride maximum sandy loam (298mg kg-1, 267mg kg?1, 226mg 113mg lowest loamy sand (33mg 24mg 30mg respectively. Elovich power function models best explained adsorption, rate constants negatively soil type. Pearson correlation showed that extractability by dependent texture EC, CEC contents. Hence, properties should be considered recommending fertilization along crop demand K.