Conclusion
The society has been evolving, and every business nowadays has to keep in pace in order achieve sustainable and multidirectional management of resources. Hence, the role of agriculture in the society is not simply the producer; it now has a multidirectional role, as shown in Table 1 on the three functions of agricultural irrigation water.
Taiwan has joined the WTO in 2001, and the impacts of low-priced agricultural products and cancellation of tariff protection follow. These impacts cannot be ignored in view of the fragile agriculture in island, and are similarly difficult for the countries with small farm land area as well as expensive labor costs, namely Japan and Korea. How to face the crisis, and to quickly propose effective response measures, are the urgent tasks for the governments.