TY  - BOOK
AU  - Schroth, G.  .
TI  - Trees, crops and soil fertility concepts and research methods / 
SN  - 0-85199-593-4
U1  - J:1 
PY  - 2003///
CY  - Cambridge : 
PB  - CABI , 
KW  - Soil fertility-Research
ER  -