TY  - BOOK
AU  - "International Potash Institute, Bern, Switzerland"
TI  - Potassium in tropical crops and soils
U1  - "631.811.3+631.416.4(213)""1973""(082.2)   L4" 
PY  - 0000///Berne
CY  - 1973
PB  - International Potash Institute
ER  -