TY  - BOOK
AU  - Bhajan Singh
TI  - Long-term effect of NPK and Zn fertilization in maize-wheat rotation on crop yield and soil characteristics (1970-84)
U1  - ARCH 633.11 B51L 
PY  - 1986///
CY  - Ludhiana
PB  - PAU, Dept. of Soils
KW  - MAIZE
KW  - WHEAT
ER  -