Effects of Vinyl House with Sunlight Conditioning Film on the Growth and Physiology of Tobacco Seedling with Floating System

In Guizhou province, most of the tobacco production areas suffer from continuous low temperature in early stage of tobacco seedling, which delays seedling growth, decrease quality of seedlings and postpone the transplanting stage. To overcome these problems, Field experiments were conducted to compare the effects between sunlight conditioning film vinyl house and norm vinyl house. The results showed that optical nature of the film, by which the quality of tobacco seedling in the greenhouse improved significantly, especially its fresh and dry weights of root and photosynthesis, could increase effectively the light intensity of the plastic greenhouse both in sunny and overcast days, and shorten the time of seedling development by 5 days. Furthermore, the results showed that optical nature of the film was helpful for seedling to grow up quickly and for transplantation in advance. Consequently, optical nature of the film has large potential in the utilization of tobacco seedling.