Deficit Irrigation Strategy and Improving Irrigation Technology; the Optimal Adaptation in Coping with Climatic Change

In this study, deficit irrigation strategy as a lasting solution to deal with the effects of climate change in Hamedan-Bahar plain, were examined. For this purpose, at first, the effects of changes in temperature, precipitation and the release of CO2 on cropping pattern in four economic, physiology, hydrology and meteorology dimensions were analyzed. The results indicated that increased levels of carbon dioxide emissions and the climate changes, by reducing yield of agricultural crops and reduce groundwater balance, have negative effects on cropping pattern and in the most pessimistic prediction, reduce the amount of the agricultural value added about 169 billion Rials, reduce the amount of groundwater resources the extent of 11 percent and increase the economic value of water by 21 percent will be followed by 2040 in Hamedan-Bahar plain. However, the mentioned lose will be offset with the policy of 5% optimal deficit irrigation and the use of modern irrigation technologies.