TY  - BOOK
AU  - Martinus Nijhoff Publishers
TI  - Efficient use of fertilizers in agriculture
SN  - 9024728665
U1  - 631.482/MAR 
PY  - 1983///
CY  - The Hague
PB  - Martinus Nijhoff Publishers
KW  - Crop yields
KW  - Fertilizers
ER  -