吉林省公主岭市三家乡村近10公顷哈蟆塘地一直用井水灌溉,连续四年水稻亩产500～750公斤。井水种稻的关键措施有: (一)延长渠道长度和清除两侧杂草。在当天气温29.5℃的情况下,渠道每伸长50米,水温升高0.2～0.8℃。同时,在渠道常年运行时,要注意清除渠道两 Nearly 10 hectares of Haaduotang in the three villages of Gongzhuling City, Jilin Province, have been irrigated with well water for 500-450 kilograms of rice per mu for four consecutive years. Well water rice key measures are: (a) to extend the length of the channel and remove weeds on both sides. In the case of the day temperature of 29.5 ℃, the channel for each extension of 50 meters, the water temperature increased by 0.2 ~ 0.8 ℃. At the same time, perennial operation of the channel, pay attention to clear the channel two