提出课题的依据据日本报导,烤烟地膜覆盖栽培,具有保温、保湿、提早栽培、早发快长、避开台风、躲过雨季、稳产提质、扩大效益之作用。素以生产优质烟而驰名中外的河南烟区,进入七十年代以来,因多种原因所致,烟叶产量不稳,质量锐减。浓香烟味不突出,醇化潜力低,尼古丁含量少,吃味平淡,劲头不足,叶小片薄,颜色淡,组织粗糙,缺乏油涧,含氯量高,含钾量低,黑灰熄火,燃烧不良。造成烟叶产量不稳、质量下降的原因, According to the report from Japan, it is reported in Japan that cultivation of tobacco covered with plastic film has the functions of keeping warm, moisturizing, early cultivation, early onset and long, avoiding typhoon, avoiding the rainy season, steadily improving quality and expanding benefit. Sufficient production of high-quality tobacco and well-known at home and abroad of Henan tobacco area, into the seventies, due to a variety of reasons, the production of tobacco is unstable, the quality dropped sharply. Low odor, low alcohol potential, low nicotine content, mild taste, less leaflet, thin leaf color, coarse tissue, lack of oil stream, high chlorine content, low potassium content, black and gray flame, burning bad. Cause the instability of leaf yield, the reason for the decline in quality,