為穩定供應作物生長的必要耗用水量，有效利用農業水資源，提高灌溉用水管理效率，本研究在嘉南地區以試驗比較不同灌溉期距的加強灌溉管理措施對一期稻作收成的影響，以有助推動實務的節水灌溉作為。
本研究於農田水利署嘉南管理處灌溉技術推廣中心的學甲試驗田區種植水稻，在水稻進入孕穗期後，執行四種不同灌溉期距的加強灌溉管理措施，分別為7.5天、10天、12.5天與15天，又對每種期距分別種植三塊試驗田，計分成三組，過程中記錄至稻米收成期間的用水狀況及土壤含水量，收成後對稻穀進行農藝性狀分析，以探討不同用水管理方案對稻米收成數量及品質之影響，並推論如何延長灌溉期距減少灌溉配水量可同時兼顧農民收益與社會對提高用水效率之期盼。
三組試驗結果顯示灌溉期距12.5天試驗田之產量798 g/m2為最高，且稔實率62.11 %亦為最高；灌溉期距10天試驗田之產量752 g/m2為次高，稔實率58.58 %亦為次高，因此10天及12.5天之灌溉期距皆有助稻作生長且有較佳產量。此外，同一灌溉期距的試驗田土壤含水量過程極為相近，灌溉期距7.5天之試驗田總灌溉水深最大，土壤水分多數時間維持在較高的含水量，稻作耗水量也最大，灌溉期距15天之試驗田則兩者皆最低，而灌溉期距10天及12.5天的稻作日土壤含水量在田間容水量以下時平均消減耗水量為6 mm至7 mm，最有助稻作生長，試驗期間總平均灌溉用水量808 mm與722 mm較原灌溉制度之7.5天灌溉期距節省約12 %與22 %用水量，可以兼顧稻米產量及節水，前者近於供8停2、後者則為供9停3，顯示嘉南地區在嚴重乾旱情況採行灌溉期距14天的供9停5措施，應已近加強灌溉管理的節水限度。

In this study, rice was grown in the Xuejia experimental field. After the rice entered the booting stage, four different irrigation intervals were implemented to strengthen irrigation management measures, namely 7.5 days, 10 days, 12.5 days and 15 days, three test fields were planted for each period. During the process, the water consumption and soil moisture content during the rice harvest period were recorded. After the harvest, the agronomic characteristics of the rice were analyzed to explore the differences. The impact of water management schemes on the quantity and quality of rice harvest, and inferring how to extend the irrigation interval and reduce the amount of irrigation water allocation can take into account farmers’ benefits and society’s expectations for improving water use efficiency.
The results of the three sets of experiments showed that the yield of the experimental field with an irrigation period of 12.5 days was the highest with a yield of 798 g/m2, and the fertility of 62.11% was also the highest; the yield of the experimental field with an irrigation period of 10 days was the second highest with a yield of 752 g/m2, and the fertility of the experimental field was 58.58 %. It’s also the second highest, so the irrigation intervals of 10 days and 12.5 days are helpful for the growth of rice and have better yields. The total irrigation water depth of the test field is the largest when the irrigation period is 7.5 days. The soil moisture can be maintained at a higher water content most of the time. The 15-day test field was the lowest in both, and the average daily water consumption of rice cultivation with an irrigation interval of 10 days and 12.5 days was 6 mm to 7 mm, which helped the growth of rice, and could take into account rice income and water saving.

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