开春以后天气转暖,麦苗生长发育加快,麦苗对外界环境反应敏感,是争取多穗、大穗的关键时期,此时,对小麦巧施追肥,能取得显著的增产效果。春季追肥必须坚持“四看三定”,即:看墒情,看地力,看苗情,看冬肥;定基肥用量,定施肥数量,定施肥种类和时间。小麦在三月中旬追施肥料最好(因 After the spring, the weather gets warmer, the growth and development of wheat seedlings are accelerated, and the wheat seedlings are sensitive to the external environment. This is a key period for striving for more spikes and big spikes. At this moment, applying wheat topdressing can make remarkable yield increase. Spring dressing must adhere to the “four see three fixed”, namely: to see the moisture content, looking at manpower, see Miao, look at winter fertilizer; base amount of fertilizer, the amount of fertilizer, fertilizer type and time. Wheat topdressing fertilizer in mid-March is best (due to