References
- Munsell Color Company (1949). Munsell soil color charts. Baltimore.
- Penman, H. L. (1948). Natural evaporation from open water, bare soil and grass. Proc. R. Soc. A., 193, 120–146.
- Pereira, H. C., Wood, R. A., Brzostowski, H. W. and Hosegood, P. H. (1958). Water conservation by fallowing in semi-arid tropical East Africa. Emp. J. exp. Agric., 26, 213–228.
- Schuurman, J. J. and Goedewaagen, M. A. J. (1965). Methods for the examination of root systems and roots. Vada, Wageningen, Holland.