根据多年试验结果，在福建省首先确立“坑田结合”观测水稻需水量新方法，其代表性、试验精度及经济效益均优于传统的坑测法或筒测法。同时，发现水稻叶面积指数与水稻蒸腾量呈直线关系，与棵间蒸发量是双曲函数关系，建立相应的回归方程式，可应用于推算水稻需水量及灌溉定额。水稻合理灌溉可达到增产增收，其中灌溉经济效益占总收入的１６．７％左右，提出灌溉效益分析可用货币指标代替传统的物量指标表示法。根据节水灌溉的水稻需水规律，提出水稻“少灌多蓄”节水灌溉新技术，取代传统水稻田长期淹灌的栽培习惯。 According to the results of many years of experiments, a new method of measuring the water requirement of paddy field in Fujian Province was first established. Its representativeness, test accuracy and economic benefit were better than the traditional pit test or drum test. At the same time, it was found that there was a linear relationship between rice LAI and rice evapotranspiration, which was a hyperbolic function relationship with the soil evaporation. The corresponding regression equation was established and could be used to estimate the rice water requirement and irrigation quota. Reasonable irrigation of rice can increase production and increase income, of which irrigation economic benefits account for about 16.7% of the total income. It is proposed that the analysis of irrigation benefit can use the monetary indicator instead of the traditional representation of the quantity index. According to the law of water requirement for water-saving irrigation, a new technology of water-saving irrigation for “less irrigation and more storage” was proposed to replace the cultivation habit of long-term submerged irrigation in traditional rice fields.