TY  - BOOK
AU  - S. P. Sen
AU  -  Y. P. Abrol  S. K. Sinha
TI  - Nitrogen assimilation and crop productivity
U1  - 589.9506 
PY  - 1978///
CY  - New Delhi
PB  - Associated Publishing Co.
N1  - S. P. Sen; Y. P. Abrol & S. K. Sinha: Nitrogen assimilation and crop productivity.  New Delhi.  Associated Publishing Co., 1978.--(589.9506SEN)
ER  -