1. Dutta R N, Jha U N and Jha S N 1984 Soil properties and water qualities of pond as influenced by makhana (E. ferox) cultivation in Darbhanga Area. Plant and Soil 80, 451–445.
2. Iyengar B R V, Krishnappa Naik C S and Bakro S G 1982 Transformation and availability of phosphorus applied to soil under coffee. J. Indian Soc. Soil. Sci. 30, 285–90.
3. Minhas R C and Bora N C 1982 Distribution of organic carbon and the forms of nitrogen in a topographic sequence of soils. J. Indian Soc. Soil Sci. 30, 135–39.
4. Odum H T 1956 Primary production in flowing water. Limnol and Oceangr. 1, 102–17.
5. Sarkar A K and Deb D L 1982 Zinc fractions in rice and their contribution to plant uptake. J. Indian Soc. Soil Sci. 30, 63–69.