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为进一步弄清地膜烟不同揭膜时间的产质效应，经多年多点试验，结果表明，各盖膜处理的产量均显著高于对照，但以移栽后４５ ｄ 揭膜和第一次采收脚叶后揭膜最高，分别较对照提高１０．４６％ 和１０．０９％ 。低海拔地区（＜ １ ０００ ｍ ）以前者最高，高海拔地区（≥１ ０００ ｍ ）以后者最高，表明随海拔的升高，盖膜时间应适当延长，反之，应适当缩短。烟叶质量，盖膜后均有所提高，但无显著差异。盖膜后，产质效应在高海拔地区比低海拔地区明显，表明地膜烟更适于高海拔烟区栽培。生育期变化：随盖膜时间缩短生育期逐渐加长，直至接近对照。即全生育期盖膜平均可缩短７．５ ｄ，第一次采收脚叶后揭膜为４．５ ｄ，栽后４５ ｄ 揭膜为２．５ ｄ。
In order to further clarify the quality effects of different film mulching film mulching time, after many years of trial, the results showed that the yield of each mulching film was significantly higher than the control, but 45 days after transplanting film and the first mining After harvesting leaves the highest film, respectively, compared with the control increased 10.46% and 10.09%. The former was the highest in the low altitude (<1 000 m) and the latter was the highest in the high altitude (≥1 000 m), indicating that the cover time should be properly extended with the altitude increasing, and should be shortened appropriately. Tobacco leaf quality, after the film were improved, but no significant difference. After mulching, the effect of yield and quality was more obvious in high altitude than in low altitude, which indicated that mulch was more suitable for high altitude tobacco cultivation. Growth period changes: With the cover film time to shorten the growth period gradually extended until close to control. That is to say, the average length of cover film during the whole growth period can be shortened by 7.5 days, after the first harvest, the number of exposures was 4.5 days and 45 days after transplanting.