TY  - BOOK
AU  - Gupta U S
TI  - Crop improvement : Physiological attributes V .1
SN  - 81 204 0596 x
U1  - 631.58 
PY  - 1992///
CY  - New Delhi
PB  - Oxford & IBH Publishing Co.Pvt.Ltd.
KW  - nitrogen fexation
KW  - Photosensitivity
ER  -