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玉米种子低温冻害是我国东北地区常见的一种坏种现象,这种坏种与气候因素关系极大,在1969～1979年之间,平均每两年就有一次大规模、普遍性的冻害坏种。仅辽宁省每次坏种都在数百万斤以上。玉米属晚秋作物,收获较迟,另外,玉米果穗紧包在里面,水分不易蒸发,含水量较高,多数在25%～35%,在贮藏时来不及充分干燥。因此在田间或贮藏中遇到低温极易产生冻害,使玉米种子发芽率下降,给生产带来较大损失。
Low-temperature frost damage of maize seeds is a common phenomenon in Northeastern China. This kind of bad species has a great relationship with climatic factors. Between 1969 and 1979, there was a large-scale and widespread frost damage every two years on average Species. Only Liaoning Province, each bad species in millions of pounds or more. Late autumn crop of corn is harvested later, in addition, corn ear tight tight inside, moisture is not easy to evaporate, high water content, mostly in 25% to 35%, too late to fully dry in storage. Therefore, it is easy to produce frost damage in low temperature during storage in the field or in storage, so that the germination rate of corn seeds is reduced, which brings great losses to the production.