TY  - BOOK
AU  - SINGH, A.L
TI  - Nitrogen fixation in Indian rice fields (Azolla & blue green algae)
U1  - 637.18 S48N 
PY  - 1989///
PB  - Bikaner
KW  - RICE -- NUTRITION
KW  - AZOLLA AS FERTILIZER
KW  - BLUE - GREEN ALGAE
KW  - NITROGEN -- FIXATION
KW  - NITROGEN -- FIXING ALGAE
ER  -