通过2009、2010年不同熟期玉米品种栽培试验和生产调查,对晚熟玉米品种在极端气候条件下的风险性进行对比研究。结果表明,晚熟品种受秋旱的影响更大,而熟期较短的品种可在一定程度上躲避“秋吊”。晚熟品种雌穗分化、散粉抽丝和灌浆期与阴雨季节重叠,长时间重度阴雨天易造成晚熟品种空秆和秃尖,而熟期较短的品种则较早地进入该发育阶段,躲避不利天气的影响。耐密植的中熟、中晚熟品种具有较强的耐荫性,因而保持良好的孕穗和结实能力。品种间的耐荫性差异警示为应对极端的气候条件,加强对品种耐阴性的选育,避免品种单一化或品种间遗传背景相近,从遗传角度积极地规避风险。适时早播可作为该地区抵御此类气象灾害的有效措施。 By 2009 and 2010 different maturity cultivars of corn cultivation and production surveys, the late maturity of corn varieties in extreme climatic conditions were compared risk. The results showed that the late-maturing varieties were more affected by autumn drought, while the varieties with shorter maturity could avoid “autumn hanging” to a certain extent. The late maturing varieties of ear differentiation, loose powder spinning and filling stage overlap with the rainy season, heavy rainy days can easily lead to late-maturing varieties of empty stalks and bald sharp, while the shorter maturity varieties earlier entered the developmental stage, to avoid disadvantages The impact of the weather Close tolerance of medium maturity, late maturing varieties have strong shade tolerance, thus maintaining a good booting and firmness. Differences in shade tolerance between cultivars To cope with extreme climatic conditions, enhance breeding of varieties resistant to the negative, to avoid breed simplification or similar genetic backgrounds among the breeds, and actively avoid the risk from the genetic point of view. Early sowing timely and can be used as effective measures to resist such meteorological disasters in the area.