بررسی مقدماتی تاثیر آبیاری کم در بهبود مراتع

Response of five different mixture or Range plants to irrigation intervals was studied for two years. Irrigation intervals included. ۲۰,۳۰,۴۰,۵۰,۶۰ days and nil and the mixtures were as follows. Mixture I Sainfoin,Bromegrass,Reed can arygrass, Intermediate wheatgrass. Mixture II Sainfoin, Burnette, Wild rye, Russian Wild-rye Crested wheatgrass. Mixtur III Alfalfa{Yazdi),Burnette,Cres ted wheatgrass,Russian wild-rye, White clover Mixture IV Tall fescue,Intermediate wheatgrass, Alfalfa (Cody), Reed Canary grass, Fairway wheatgrass. Mixture V Tall fescue, Bromegrass Cres ted wheatgrass Alfalfa (Hamadani) ,Sai nfoin. Some plots with no seeds were also incl uded. In general increasing the interval between irrigation seems to decrease the yield Per.unit area and this was more ap parent in the second harvest. Although dry _. _ _ matter content did not show a constant trend to irrigation intervals but here again this was much higher for the seco nd harvest than the first one. The percent of grass dry matter was much higher in the ۲۰-day interval than others but a reverse case was obtai ned for the legumes. This appears to be, in part, due to the different nature of these groups of the plant in their respo nse to moisture. ۲۰-day interval and to some extent ۳۰ day,seems to be Promissing with regard to dry matter Production and the most promissing mixtures include different combination of Alfalfa, Sainfoin, Brome grass, wheatgrass Crested wheatgrass species, particulary and Burnette. They will be studied in more detail in the next year.