旱地地膜覆盖玉米在不同生育期进行揭膜处理，其生理性状和产量都有明显差异，尤其是大喇叭口揭膜，由于适当地利用了生育前期覆膜的增温保墒效应，揭膜后又提高了土壤的透气性和接纳降雨的数量，因此，玉米在不同生育期的根系活力、功能叶水势、硝酸还原酶活力、叶绿素含量、净光合速率、游离脯氨酸含量等生理指标均有相应变化，早衰现象得到缓减、百粒重增加，产量高于其他处理。 Dry film mulching of maize uncovering film at different growth stages, the physiological properties and yield have significant differences, especially the large bell mouth film, due to the proper use of the pre-incubation membrane warming warming effect, uncovering after Therefore, the physiological indexes such as root vigor, functional leaf water potential, nitrate reductase activity, chlorophyll content, net photosynthetic rate and free proline content of maize at different growth stages all increased accordingly Changes, premature decline have been mitigated, 100-grain weight increase, the yield is higher than other treatments.