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从我站1960—1965年和1972—1975年十年早稻分期播种试验资料来看,大多数年份早稻在日平均气温低于12℃播种的,比在邻近播期气温稳定高于12℃播种的平均亩产要高60斤左右。尤其是在种子芽期出现霜冻时,在日平均气温12℃以下播种的增产更显著。如1960、1964、1972和1974年均在芽期出现一天霜冻,最低气温分别降到4.5、1.2、3.7、3.5℃,低温播种的平均每亩多收稻谷几十斤到100多斤。
According to the data of sowing dates from 1960 to 1965 in our country and ten to ten years in 1972-1975, most of the years were sown at a mean daily temperature below 12 ℃ and sowed more stable than the neighboring sowing date at temperatures above 12 ℃ The average mu yield is about 60 pounds high. Especially in the seed germination of frost, the average daily temperature below 12 ℃ sowing more significant increase. For example, in 1960, 1964, 1972 and 1974, one frost appeared at the bud stage, the minimum temperature dropped to 4.5, 1.2, 3.7 and 3.5 ℃ respectively.