【研究目的】为探索适宜本地区种植玉米品种的播期，及在遇到低温冷害等极端天气需要选择的替代品种及播期。【方法】2016和2017年，在哈尔滨地区以早熟、中熟、晚熟3个不同熟期各2个玉米品种为测试材料，明确不同播期下对玉米的生育期和产量及其构成的影响。【结果】哈尔滨当地品种最迟播种时间为5月6日，能够保证玉米正常成熟；但就产量而言，在5月06日以后中熟品种产量高于晚熟品种，但产量均呈降低趋势。如前期遇到低温冷害等极端天气，推迟到5月中旬左右时，应选择中熟品种代替晚熟，能保证玉米产量安全。
英文摘要:
[Objective] In order to explore the suitable planting time of maize varieties in this region, the alternative varieties and planting time should be chosen in the extreme weather such as low temperature and cold damage. [Methods] In 2016 and 2017, in Harbin region for early, medium and late three different period the two maize varieties as the test material, the growth period of maize under different sowing date and the influence of yield and its components. [Results] The latest planting date for local varieties in Harbin is May 6th, which can ensure the normal maturity of corn. However, in terms of yield, after May 06, the yield of medium-maturity varieties was higher than that of late-maturity varieties, but the yield showed a decreasing trend. If the extreme weather such as low temperature and cold damage is encountered in the early stage, when it is delayed to the middle of may, the medium-maturity varieties should be selected to replace the late-maturity varieties, which can guarantee the safety of corn production.
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