TY  - BOOK
AU  - Sharma, Ravinder Kumar
TI  - Role of herbicides in reducing frequency of preparatory tillage operations in maize and wheat
U1  - T 633.151 S33R 
PY  - 1972///
CY  - Ludhiana
PB  - P. A. U.
KW  - HERBICIDES
KW  - PLOUGHING
KW  - TILLAGE
ER  -