小麦生长中后期需肥量大,土壤施肥往往难以满足,特别是在小麦生长后期,根系衰老,吸收功能减弱,从土壤中吸收肥料少,若不及时进行叶面施肥,势必引起早衰,影响产量。叶面喷肥具有方法简单,肥效迅速、利用率高的特点,不仅可以弥补根系对养分吸收的不足,满足小麦生长发育需要,还可以改善田间小气候,减少干热风的 In the middle and later stages of wheat growth, the amount of fertilizer required is large and soil fertilization is often difficult to meet. Especially in the late wheat growing season, the roots are senesced and their absorption function weakened. Absorption of fertilizer from the soil is small. Failure to timely foliar fertilization will inevitably cause premature aging and affect the yield . Foliar spraying has the advantages of simple method, rapid fertilizer use and high utilization rate, which not only can make up for the lack of nutrients absorbed by the root system, but also can improve the microclimate in the field and reduce the dry and hot wind