- Adbel – Aziz, J.M (1986). Ann. Agric . Sci. Fac. Agric. Ain Shams. Univ., Cairo, 31, 1211-1226.
- Brar,S.P.S., et al (1980) J. Punjab Agric.Univ.,17:29-33
- Channal, H.T (1992) Ph.D Thesis, Tamil Nadu Agricultural University, Coimbatore.
- Duraisami, V.P. and A.K. Mani (2002) Mysore J. Agr. Sci., 36(3): 212-217.
- Jadhav, S.S., et al (2003) J. Soils and Crops. 13(1): 69 – 72.
- Perla,L., et al (1973) Soil. Sci., 115: 380-389.
- Ram Sakal (2001). J. Indian Soc. Soil. Sci., 49(4): 593-608
- Raveendran (2005). In: Training Manual Edited by Chandrasekaran, Jayaraj, Vaithilingam, Saminathan and Anbumani. 18: 31.
- Singh , A.P., et al (1982) J. . Indian Soc. Soil. Sci., 30(4): 572-573.
- Verma, C.P, et al (2001) Crop Res., 21(3): 382-383 .