TY  - BOOK
AU  - Kumarasinghe,K.S.
AU  - Eskew,D.L.
TI  - Isotopic studies of Azolla and nitrogen fertilization of rice / 
PY  - 1993///
CY  - Dordrecht : 
PB  - Kluwer Academic Publishers, 
KW  - Rice
KW  - Fertiliizers
KW  - Azolla as fertilisers
KW  - Nitrogen fertilisers
ER  -