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董庄大队一九七五年的烤烟育苗、移栽分两批进行;第一批是“小寒”后两天(元月八日),三月二十五日移栽.第二批“立春”(二月四日),四月上旬移栽.第一批育苗时,大气平均气温只有4-5℃,中午最高温度也不过11-12℃,盖上单层塑料薄膜的苗床最高温度20-22℃.苗床内小气候保持这样的温度,每天只有五、六个小时,其它十八、九个小时虽然不是临界气温,但他对烟苗生长很不利.为了保证烟苗的正常生长,将苗床改为双层塑料薄膜覆盖.外界气温8℃时,双层覆盖的苗床温度可达到
Dong Chong Brigade flue-cured tobacco cultivation in 1975, transplanting in two batches; the first batch is “Osamu” two days (January 8), March 25 transplanting. The second batch of "Lichun (February 4), transplanted in early April, the first batch of nursery, the average temperature of the atmosphere is only 4-5 ℃, noon the maximum temperature of 11-12 ℃, covered with a single layer of plastic film seedbed maximum temperature 20 -22 ℃. The microclimate in the seedbed maintained at such a temperature, only five or six hours a day, the other eighteen to nine hours, although not critical temperature, but he is very unfavorable to the growth of tobacco seedlings in order to ensure the normal growth of tobacco seedlings, will Seedbed changed to double plastic film coverage.Under the outside temperature of 8 ℃, double covered seedbed temperature can be reached