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为探索烤烟小苗膜下移栽适宜的破口温度及大小,为指导大田生产提供理论依据。笔者通过大田试验,比较了白、黑膜膜内外空气温度、塘底土壤温度及不同破口大小的温度变化。结果表明:随着田间空气温度的增加,膜内空气温度随之大幅度增加,白膜膜内温度均大于黑膜膜内温度。当田间空气温度低于20℃时,通过小苗膜下移栽改变烟苗生长环境可达到保温的作用;田间空气温度高于27℃时,膜内空气温度达到45℃时,应及时进行破大孔处理,以防高温灼伤烟苗。在环境温度可以保障烟苗生长需求的前提下,较早破口相对利于烟苗生长。
To explore the flue-cured tobacco seedling transplanting appropriate temperature and size of the break, to provide a theoretical basis for field production. Through field experiments, the author compared the air temperature inside and outside of the white and black film, the temperature of the soil at the bottom of the pond, and the temperature change of different breaking sizes. The results show that with the increase of air temperature in the field, the temperature of the air in the membrane increases greatly, and the temperature in the membrane of the white membrane is greater than the temperature in the membrane of the black membrane. When the air temperature in the field is below 20 ℃, the growth environment of tobacco seedlings can be changed by the film seedling transplanting to achieve the effect of heat preservation. When the air temperature in the field is higher than 27 ℃, the air temperature in the film should reach 45 ℃, Hole treatment to prevent high temperature burn tobacco seedlings. Under the premise of the ambient temperature can protect the growth of tobacco seedlings, the earlier break relatively conducive to the growth of tobacco seedlings.