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根据井水温度低这一特点,井灌稻田在水肥管理上要注意以下几点:1.提高井水温度,预防冷害井水温度一般为8～10℃,比河水低5～7℃,如不注意灌溉方法,很容易使水稻因冷害而减产。因此,千方百计提高井水温度是获得井灌水稻高产的重要环节。提高并水温度的办法有:①在井口附近修一个面积至少有半亩地大小的田格做晒水池,水池出口要设在高手池底40～50厘米处,使上部晒热的水不断流入稻田。②延长灌溉渠道。据测,渠道每延长100米,水温大约提高1℃。因此,渠道长度至少要在200米以上。如能将渠首50米覆盖上塑料薄膜,增温效果更好。③勤换灌水口。最好从条田两侧交替灌水,防止稻田局部冷害。④尽量减少灌水次数,提倡圈水。灌水要在清晨或上午进行,以使田水尽快晒热。⑤如稻田漏水,每亩可施入1,500～2,000
According to the characteristics of low well water temperature, well irrigation paddy field fertilizer and fertilizer management should pay attention to the following points: 1. To raise the well water temperature to prevent cold damage well water temperature is generally 8 ~ 10 ℃, 5 ~ 7 ℃ lower than the river, and if not Pay attention to irrigation methods, it is easy to reduce the yield of rice due to cold damage. Therefore, to do everything possible to raise the well water temperature is an important part of obtaining high yield of well-irrigation rice. Methods to improve the temperature of the water are: ① in the vicinity of the wellhead repair an area of at least half an area of the size of the field to do the sun pool, pool outlet to be located in the master pool 40 to 50 cm, so that the upper part of the hot water constantly inflow paddy. ② extend irrigation channels. It is measured, each extension of the channel 100 meters, the water temperature increased by about 1 ℃. Therefore, the length of the channel at least 200 meters. If the canopy 50 meters covered with plastic film, warming better. ③ frequently change irrigation mouth. It is best to alternately irrigate the two sides of the field to prevent local cold damage in the rice fields. ④ try to reduce the frequency of irrigation, advocating circle water. Irrigation to be carried out in the early morning or morning to make the field water as soon as possible. ⑤ such as rice fields leaking, per mu can be applied 1,500 to 2,000