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Analysis and Improvement on Lower Usability of Upper leaf Tobacco

Zhang Yongan et al (Agronomy Department of Anhui Agricultural University,Hefei,Anhui 230036)  
At present, there are some factors that restrict upper leaf usability in our country. This article sum up various facts in this field. With view to physiology and biochemical of flue-cured, system analysis on influence factors on usability of upper leaf and the control technology of nicotine such as environmental,nutrition and apply fertilizer, agronomic measure, modulating etc. The survey our country is solving the usability and research developing, way and method. Some technological routes suitable for settling this problem have put forward.
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