1. ANON. (1988 ). National Institute of Agricultural Botany (1988) .Bulletin of crop varieties and seeds. 69 pp.
2. The development of winter wheat in the field. 2. The control of primordium initiation rate by temperature and photoperiod
3. R. W. Daniels, and D. H. Scarisbrick (1983 ). Oilseed rape physiology . InNational Agricultural Centre Course Papers (1983), pp.29 -46 .
4. E. J. Evans, and A. A. E. Ghobashi (1983 ). Effect of leaf removal on the growth of winter oilseed rape (Brassica napusL.) . InProceedings of the 6th International Rapeseed Congress, Paris, France, pp.114 -119 .