TY  - BOOK
AU  - Sowmya D.
AU  -  K. K. Math, 
TI  - Effect of nutrient sources on soil fertility and cowpea (vigna unguiculata I .) productivity in vertisol of northern transition 
U1  - 630 
PY  - 2014///
CY  - Dharwad
PB  - University of Agricultural Sciences
ER  -