TY  - GEN
AU  - Grewal,  J S
AU  - Kanwar, J S
TI  - Pottassium and ammonium fixation in Indian Soils : a review
U1  - 631.840 76 GRE 
CY  - Newdelhi, I C A R
KW  - Soil science/ soil pottassium fixation / Soil ammonium fixation
ER  -