TY  - BOOK
AU  - 
TI  - Proceedings of colloquium of the International Potash Institue: Development of K-fertilizer recommendations :Proceedings
AV  - S645 .I5 1990
PY  - 1990///
CY  - Bern, Switzerland
PB  - International Potash Institute
KW  - Potassium fertilizers
KW  - K-fertilizer development
ER  -