- Behera, U.K and Jha, KP. (1992). Indian Frog., 42(4): 4-10.
- Bhattacharya, H.C. and Singh, KN. (1992). Indian J. Agron., 37(4): 681-685.
- Biswas, C.R. eta! (1989).IRRN, 14(6):18-19.
- Moorthy, B.T.e. and Mitra, B.N. (1990). Crop Res., 3: 144-150.
- Narendrapandey, N. eta! (1992). Ann. Agric. Res., 13: 372-317.
- Prasad, B. and Rokima, J. (1991). J. Indian Soc. Soil Sci., 39: 783-785.
- Prasad, M. and Rao, MV (1989). Oryza, 26: 187-189.
- Sambasivam, A. (1986). M.Sc. (Ag) Thesis, Tamil Nadu Agric. Univ., Coimbatore - 641003.
- Tandon, H.L.S. (1994). Methods of Soil, Plant and Water Analysis. FEDCO, New Delhi.