Agricultural Field Water Management Model and Control Technique for Shangyun Region（2）

The statistics of water use in Taiwan shows the agricultural water accounts for about 70 percent of total water consumption all over the country. General public often raises the challenge on the adequacy of this great proportion of water usage quantity and questions the needs for saving water on agricultural, especially during the drought years. Quite often the case when a severe drought happens, agricultural water is often the first sector to be sacrificed to make room for the supplying water for other sectors, such as municipal water supply and industrial water demand. Part of the justification on this decision if based on to the fate that irrigation water has a high degree of merit to endure water shortage. However, the stratagem on water saving should not be based on capacity of endurances but should be from the perspective of the overall value generated by water supply. The monetary term of the production in the industrial sector or the welfare of residents consuming water cannot be used to compare the value of agricultural water usage, for the lack of same unit in comparison. The value of supplying water for agriculture is not only to produce food, but also to maintain the quality of ecological environment. Therefore, to improve the accuracy of the estimation of agricultural waterrequirement, and to deployment capability on the continuous improvement of agriculture irrigation efficiency become a crucial issue and is studied in this project. The goal is to strengthen irrigation management to save the agricultural water in draught periods, so that excess water can play a greater efficacy in the industrial and commercial development. To enhance the efficiency of irrigation water, the government of Taiwan is actively promoting the project, named “Chang Yun regional gold corridor project，，. Council of Agriculture funds Irrigation Association to improve water pipeline systems to effectively save water. However, for paddy irrigation which accounts for the largest part of water usage, there is still a considerable opportunities to save water. Therefore, this study is focused on the establishment of a experimental field for the test of a precision irrigation model. Through the identifying of the water requirement of the demand side, the management of the irrigation water on field can be regulated in a way that the production and ecological benefits are all considered at the same time. Such information provides basic need to strengthen irrigation management measures, and to enhance the efficiency of irrigation water in the agricultural sector.