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我区春小麦一般在二叶一心至三叶期开始幼穗分化(约在4月15~20日前后),此时小麦幼苗急需养分,但因地温较低,土壤速效养分含量较少,不能满足小苗生长发育的需要。而第一次追肥往往在5月10日前后淌头水时进行,这时小麦已进入小花或雌雄蕊分化,追肥对穗分化的作用嫌迟。为了探
In our district, the spring wheat generally begins to spikelet differentiation from about one leaf to three leaf stage (about 15 to 20 April), wheat seedlings are in urgent need of nutrients at this time, but because of low ground temperature and less available soil nutrient content, Seedlings growth and development needs. The first top dressing is often carried out in the May 10 trickle of water when the wheat has entered the floret or stamen differentiation, top dressing differentiation of the role of too late. In order to explore