The Changing Role of Irrigation Method in Agricultural Sustainability

In the past two decades, the use of pressurized irrigation methods has many applications to reduce losses and water consumption, increase efficiency and productivity of irrigation water, increase yield and reduce harvesting of ground water resources. To assess the effect of changing irrigation methods, a study was conducted on a number of fields of plains of Mashhad and Fariman in 2009. Results showed that, by changing the surface irrigation methods to pressurize, the average amount of water consumed by agriculture and gardens has decreased 27.5 percent and the weighted average total yield of products, about 36 percent and the average amount of irrigation water use efficiency has increased, 95.1. Using irrigation methods, with positive evaluation and a high rate of economic justification. Removal of underground water resources, 10.9 percent had been killed, but the total surface cultivated fields of study, 1532 ha (14.8 percent) to 1759 ha is reached. Reduce the harvest of underground water resources, often due to discharge from the wells has been reduced and has no connection with the irrigation method. On the other hands, the result showed that, use of drip irrigation at less than 10 ha, (part of a water source),were equivalent to 5.8% of total drip irrigation farm’s area and 39% of total of number of them. This could lead to fragmentation of land covered by a water source. Overall, although changes of irrigation methods were evaluated positively but still are harvested higher than the limit of underground water resources And it has not helping to agricultural sustainability of region And in the not too distant future, agricultural area will be unstable.