STATUS OF POTASSIUM FORMS IN VARIOUS SOIL ORDERS OF SOUTHERN IRANKhatereh Nobaharan, Ali Abtahi and Shahla Mahmoudi
Laboratory and field studies were planned to delineate the relationships between different forms of potassium (K) with secondary clay minerals in different soil orders of southern Iran. Twelve soil samples from 12 representative pedons were analyzed to determine physical, chemical, mineralogical characteristics and different K forms. Studied soils were classified as Entisols, Inceptisols, Alfisols and Aridisols. Smectite, chlorite, illite, palygorskite, vermiculite, and kaolinite were observed as dominant clay minerals in the studied soils. The results showed that exchangeable K, non-exchangeable K, and structure K are greatly influenced by clay mineralogy. However, there was not a significant correlation between soluble K and clay minerals. In addition, among the secondary clay minerals, smectite had the most important role to determine K forms in the present study
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