TY  - GEN
TI  -  cropping systems research: on-farm research manual
U1  - 631.558 
PY  - 1990///
CY  - Pilippines
PB  - Department of Agriculture bureau of Agricultural research
KW  - AGRICULTURE
KW  - TECHNOLOGY VERIFICATION TRIALS ON FARMERS FIELD
KW  - CROPPING SYSTEMS
ER  -