TY  - SER
AU  - van Burg, P. F. J.,
TI  - Fertilizer Research Vol. 2(1-4), Vol. 7(1-3)
U1  - 631 
PY  - 1981///-85
CY  - Hague
PB  - Martinus Nijhoff Publishers
KW  - Fertilizers
KW  - Techniques, equipment & materials
ER  -