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我社水稻地棚育苗从1975年试验成功后,1976年发展到大面积地棚1,255个。实践表明,它是战胜低温、预防冷害、安全早育大秧壮秧、拔苗机械插秧的新途径。好处(一)防止低温冷害和高温热害:由于地棚内空间大,直射光多,温度上升快,始终处于蒸气饱和状态,温度下降缓慢,能保持秧苗正常生育温度,不致受到冷害。如1976年4月22日晚下了一场大雪,23日14时气温下降到1℃、地温(露地)8℃时,地棚内床温为19℃,地温为21℃,一直到翌日凌晨2点床温仍高于9℃,仅在凌晨4—5点降温到5—7℃,而塑料薄
After the successful trial of rice nursery in 1975, it has developed to 1,255 large-scale shelters in 1976. Practice shows that it is a new way to overcome the low temperature, prevent cold damage, safe and early nursery big seedling seedlings, mechanical seedlings plucking seedlings. Advantages (A) to prevent cold damage and high temperature heat damage: As a result of the large shed space, direct light, the temperature rises quickly, and always in the vapor saturation state, the temperature dropped slowly, can maintain the normal seedling temperature, will not be cold damage. For example, a heavy snowfall occurred on April 22, 1976, and the temperature dropped to 1 ° C at 14:00 on the 23rd. When the ground temperature (open field) was 8 ° C, the bed temperature in the greenhouse was 19 ° C and the ground temperature was 21 ° C until midnight next day 2:00 bed temperature is still higher than 9 ℃, 4-5 o’clock in the morning only cooled to 5-7 ℃, while the plastic thin