Data presented in Table (4) showed that the mutagenic treatments did not change 1000-grain weight. Therefore, all treatments means had nearly the same value of 1000-grain weight and the range of variability for irradiated plants were similar to that of the control plants. So, the doses of gamma-rays in the present work were not able to induce marked variation within their population in 1000-grain weight. Grain yield was significantly affected by mutagenic treatments. The non-treated plants recorded significantly higher grain yield than the treated plants. However, the differences among the three mutagenic treatments were not significant. The measurements of variation (range of variability and coefficient of variation) in the treated plants were higher than those of the control. The coefficient of variability on the treated plants was greater several times than the control. Similar findings were reported by Mohamed et al. (2006).