Crop fertilization with potassium in rainfed agriculture in India is altogether missing merely on the assumption that Indian soils are rich in potassium and crops do not need external potassium supply. However, under continuous cropping in rainfed regions, most of the crops essentially deplete soil potassium reserves. Balanced fertilization is essential for maximum yields and maintenance of soil fertility. The maximum benefit due to application of N, P, K fertilizers and even secondary nutrients is not obtained in absence of adequate quantities of available micronutrients in the soil. Foliar...