TY  - GEN
AU  - Wijewardene, Ray
AU  - Waidyanatha, Parakrama
TI  - Systems,techniques & tools conservation farming: for small farmers in the humid tropics
U1  - 631.451 
CY  - Colombo
PB  - Marga publications
KW  - Agriculture and related technologies
KW  - Conservation tillage
KW  - Soil erosion
KW  - Soil science
KW  - Specific techniques
ER  -