Potassium (K) is vital to many plant processes and the knowledge about different forms and availability of potassium is must while studying the response of crops to K. Because Potassium supply to crop plants is a complex phenomenon involving relationships among various K fractions in soil. Potassium is available in the soil in different forms and amount viz., water soluble K, exchangeable K, fixed K and mineral K. Plants utilize not only the readily available K but also the non-exchangeable and mineral K during the crop growth. | Forms of potassium in soil and their relationship with soil properties - A review
