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我国东北地区及其他省份的高寒山区,玉米苗期常遇低温冷害。选用抗冷性强的品种进行早播,充分利用早春的空闲积温,是促进早熟高产的重要措施。如何鉴定现有生产品种的苗期抗冷能力?这里介绍一种用出苗率、出苗指数、苗期干物重为苗期抗冷指标的鉴定方法,可供参考。具体作法:分三期播种。当5厘米土层日平均温度为3℃左右,进行第一期播种;日平均温度6℃左右,进行第二期播种;日平均温度为8℃左右,进行第
China’s northeastern regions and other provinces in the alpine mountains, maize seedlings often encounter chilling damage. Selection of cold-resistant varieties of early sowing, take full advantage of the idle accumulated temperature in early spring, is an important measure to promote early maturity and high yield. How to identify the existing varieties of cold-resistant seedling capacity? Here to introduce a seedling rate, the emergence index, seedling dry weight is the cold tolerance of seedling stage identification method for reference. Specific approach: three seeding. When the average daily temperature of 5 cm soil layer is about 3 ℃, the first seeding is carried out; the daily average temperature is about 6 ℃; the second seeding is carried out; the daily average temperature is about 8 ℃;