春小麦的生育后期,常因受到天气等条件的影响,出现“青干”和“热干风”的危害,形成逼熟早衰,致使粒重明显下降,严重地影响着小麦的生产。近年来,随着农业学大寨运动的深入发展,广大贫下中农和科技人员做了不少试验研究工作,积累了不少防御“青干”和“热干风”的经验,提出了一些有益的措施,对其形成的原因也进行了研究, The late growth period of spring wheat is often affected by the weather and other conditions, the emergence of “green dry” and “hot dry wind” hazards, the formation of forced premature aging, resulting in significant decline in grain weight, seriously affecting the wheat production. In recent years, with the deepening development of the Dazhai Agricultural Movement, many experimental and research work has been done by the poor and middle-level peasants and scientific and technological personnel, and accumulated a great deal of experience in defense of “green dryness” and “hot dry wind” and put forward some beneficial The measures of its formation have also been studied,