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冀中低洼地区气候多变,在小麦幼穗形成期往往出现倒春寒,籽粒形成期常常碰到干热风,严重影响小麦正常生长.据试验,影响枯熟主要有四个方面:1.气象因素:前期积温较正常年少70～80℃,因此延缓后期生育阶段,使灌浆时间缩短,由于低温小麦根系伸展范围减小,吸肥率降低,加重后期干热风的危害程度;日照少,光合强度低,抽穗前,阴雨日多,影响推迟植株营养体的正常生长,分蘖率较正常年减少38.4％;后期高温干热风,小麦小花不孕率达7.7～16.6％。干热风使小麦旗叶失绿,加速籽粒失水,灌浆迅速结束,日增长量低,造成枯熟减产。2.一般低洼地区是前
Jizhong low-lying areas of the climate change, tend to appear in late spring wheat panicle formation period, the grain formation often encounter dry and hot wind, seriously affecting the normal growth of wheat.According to the test, the impact of dry mainly in four aspects: 1. Meteorological factors: The accumulated temperature in the early stage was 70-80 ℃ lower than that in normal years, therefore, the late filling stage was delayed and the filling time was shortened. As the extension range of root system of low temperature wheat decreased, Before heading, the overcast rainy day affected the normal growth of vegetative body postponed. The tillering rate was reduced by 38.4% compared with the normal year. In the later stage, the hot and dry wind with high temperature and the rate of inflorescence of wheat reached 7.7-16.6%. Dry hot wind leaves wheat flag green, accelerating grain dehydration, grouting quickly ended, low daily growth, resulting in dry production. 2. The general low-lying area is the former