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用井水直接灌溉稻田,由于水温低,会造成冷害。富密灌区灌溉试验站多年观测证明,井水比地表水温度要低5—6℃。如直接灌稻,全生育期积温要低200℃以上,因而带来两大弊病: 一是影响稻种发芽率和田间保苗率。用井水直接灌溉,直播田每垧地用种量为700—800斤,比地表水灌溉多用100—200斤。插秧返青时间要晚5—8天;二是无效分蘖多,空秕粒多。特别是
Irrigating paddy fields directly with well water can result in chilling injury due to low water temperatures. The years of irrigation test station in Fumi irrigation district have proved that well water has a temperature of 5-6 ℃ lower than that of surface water. Such as direct irrigation, the whole growth period lower than 200 degrees Celsius, resulting in two major drawbacks: First, the impact of rice seed germination rate and field seedling rate. Direct irrigation with well water, direct seeding Tian peri with a species of 700-800 kg, more than surface water irrigation with 100-200 kg. Replacing greening time to late 5-8 days; Second, more than invalid tiller, Kong Kong tablets and more. especially