TY  - BK
AU  - Safo,E.Y.
TI  - Soil fertility and maize production
T2  - CRI Crop Management Guide
PY  - 1993///
CY  - Tamale (Ghana)
PB  - CRI, 
KW  - Organic matter
KW  - Plant production
KW  - Plant soil relations
KW  - Zea mays
KW  - AGROVOC
KW  - Soil fertility
ER  -