Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi, 110012
*Present address: Central Soil Salinity Research Station, Canning Town, West Bengal, 743329
The usefulness of potassium activity ratio (KAR) in soil solution in predicting the crop response to potassium under varying levels of potassium, calcium and magnesium was studied for alluvial, black and laterite soils. KAR had a close relationship with K absorption by wheat in the absence of Ca and Mg addition; but the relationship failed when Ca and Mg were added at constant level of K to vary the KAR.
Potassium activity ratio, crop response to potassium, calcium and magnesium, wheat
