TY  - SER
AU  - van Burg, P. F J.,
TI  - Fertilizer Research Vol. 4 (1-4)
U1  - 631 
PY  - 1983///
CY  - Hague
PB  - Dr. W. Junk Publishers
KW  - Fertilizers
KW  - Techniques, equipment & materials
ER  -