Riaz A. Wahed, P. Moutonnet, M. Y. Ashraf, M. H.Naqvi, C.Kirda, G. R. Tahir, A. R. Awan and M. M.Iqbal, 2001. Contribution of Irrigations to Grain Yield of Wheat (Triticum aestivum L.) At Critical Crop Growth Stages. Journal of Biological Sciences, 1: 468-471.