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适时灌好小麦头水很重要。我区国营农场掌握的一般原则是在4月温度高、天气干旱、小麦出苗早以及高田、砂田等条件下应早灌头水;4月低温多雨、地湿、出苗晚以及洼田、稻茬田等条件下头水应晚。具体灌水时机可按以下四个指标确定:①5～10厘米土层土壤含水量应小于18％;②日平均气温应大于10℃;③霜冻后不能立即灌水,应等2～3天,日最低气温回升到4℃以上方可灌水;④麦苗一般应达到4个叶片,次生根不少于3～5条。具备上述条件,灌头水一般不会发生坐苗。
Irrigation of wheat in a timely manner is very important. The general principle that the state-owned farms in our area should master is to pump the headwater early in April under the conditions of high temperature, dry weather, early emergence of wheat and fields such as Takada and sand fields. In April, it is rainy, wet, late emergence, Tian and other conditions should be late head of water. Specific timing of irrigation can be determined according to the following four indicators: ① soil moisture content of 5 ~ 10 cm soil layer should be less than 18%; ② average daily temperature should be greater than 10 ℃; ③ frost can not immediately after irrigation should be 2 to 3 days, Temperature rose to above 4 ℃ before irrigation; ④ wheat seedlings should generally reach 4 leaves, secondary roots of not less than 3 to 5. Have the above conditions, irrigation head water generally does not occur sit Miao.