EVALUATION OF EFFECTS OF SEED SIZE AND SEED DETERIORATION ON SEED GERMINATION AND SEEDLING GROWTH OF WHEAT

In other to evaluation of effects of seed size, and deterioration of the Seedling germination and growth of wheat in a laboratory test in year 2008 at Agricultural laboratory of Islamic Azad University of Gorgan branch. The experimental design was factorial (5×3), in the form in randomized completed design with 3 replications. Conducted seed size in 3 levels (Small, medium and Large) and seed deterioration in 5 levels (0, 10, 20, 30, and 40 days in 40oC). Results indicated that treatments were 0, 10, 20, 30, and 40 days of deterioration germination percentage maximum, day until 50% germination, root length, root, weight and shoot drymather, hetrotrophy weight decreased with increase in deterioration period. too results indicated that significant difference between treatments were seed size such as day until 50% germination, root and shoot lengthand drymather and hetrotrophy wieght. Improved seeds to increase the size of many measured factors was effective.