Abstract :
The concept of sustainable development related to optimum utilization from all sources in the modern world has been addressed. Given to arid and semiarid climatic conditions of Iranian plateau, sustainable use of water sources is the most essential part of developing mentioned plans. Unavailability of sufficient and appropriate water for agricultural and developmental plans has caused soil and water sources management and the necessity of their conservation become very important issues, because inappropriate planning results in degradation, erosion, salinity and ponding of soils and desertification. on the other word, in such regions the appropriate water management results in sustainable development in that region. Therefore, in this research the selection of agricultural pattern proportional to the region climate with the highest economic of scale was studied.In appropriate agricultural pattern, we should consider two important factors including amount of water consumption and high income. In order to access a sustainable agricultural spattern, water demand of main crops in Southern Khorasan was studied to obtain gross profit per hectare against one cubic meter water consumption. The results showed that some crops like corn forage, barberry, saffron, cumin and maybe sugar beet considering amount of consumptive water and obtained income are economical for farmers and are suitable for the climate of this region. Some crops including wheat, barley and alfalfa due to low economic income and high consumptive water must delete from agricultural pattern of Southern Khorasan and the other crops with low water demand and high economic of scale must be substituted. In the agricultural pattern of this province, cotton is not placed because of high water expected value.
