TY  - BOOK
AU  - Singh, SS
TI  - Principles and practice of agronomy
SN  - 8170964490
U1  - 630 
PY  - 1991///
CY  - New Delhi
PB  - Kalyani Publishers
KW  - Crop planning
KW  - Seed testing
KW  - Soil fertility
ER  -