TY  - BOOK
AU  - Boesen,Jannik
AU  - Friis-Hansen,Esbern
ED  - Centret for udviklingsforskning (Denmark).
TI  - Soil fertility management in semi-arid agriculture in Tanzania : : farmers' perceptions and management practices / 
PY  - 2001///
CY  - Copenhagen, Denmark : 
PB  - Centre for Development Research, 
KW  - Soil fertility
ER  -