**Potash Research Institute of India, Sector 19, Dundahera, Gurgaon, Haryana, 122001
***NARP, Agricultural Research Station, Lam, Guntur, Andhra Pradesh
>Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, Andhra Pradesh, 522101
Present addresses: *Division of Biochemistry, Indian Agricultural Research Institute, New Delhi, 110012
