1早春冻小麦进入返青期后,生育特点明显改变,已由感温阶段进入感光阶段,麦苗的抗寒性显著降低,一旦遇到春寒,植株极易遭受冻害。防止措施:(1)划锄。在土壤返浆时进行顶凌划锄,可以松土、保墒、增温、除草,增强麦苗的御寒能力。据观测,一般划锄后7~10d,白天5cm土层内平均地温提高0.5~1℃,对促进根系发育和养分转化十分有利。因此,不论弱苗、旺苗还是壮苗,都要在返青期间抓紧划锄;对于有旺长趋势的麦田,还可以适当深锄,以抑制春季分蘖。划锄时,要注意掌握浅锄、细锄,边锄边把坷垃推散; 1 early spring wheaten into the greening period, the characteristics of fertility significantly changed from the temperature sensing stage into the light-sensitive stage, significantly reduce the cold tolerance of wheat seedlings in the event of cold, the plant vulnerable to frost damage. Preventive measures: (1) Planning hoe. In the soil back to the top of the padding Ling hoe, you can loosen soil, moisture, warming, weeding, enhance the ability of wheat seedlings warm. According to observation, after the general hoe hoeing 7 ~ 10d, during the day 5cm soil temperature increased by 0.5 ~ 1 ℃, to promote root development and nutrient conversion is very favorable. Therefore, regardless of weak seedlings, seedlings or strong seedlings, should pay close attention to the hoeing during the rejuvenation; for wheat fields with a long trend, you can also appropriate deep hoe to restrain spring tillers. Draw hoe, we should pay attention to master shallow hoe, thin hoe, hoe while pushing the Ke rub;