TY  - BOOK
AU  - Portch, Sam
AU  - Hunter, Arvel
TI  - Systematic approach to soil fertility evaluation and improvement
T2  - China program
PY  - 2003///
CY  - Hong Kong: 
PB  - Canpotex Limited, 
KW  - Agriculture
KW  - Harvesting
KW  - Soil sample
ER  -