Distribution Characteristics of Phosphorus Content in Flue-cured Tobacco and its Relationship with Conventional Chemical Components

This paper studied the distribution characteristics of phosphorus contents of 107 flue-cured tobacco leaf samples from domestic main tobacco areas and Zimbabwe,and analyzed the relationships between phosphorus contents and routine chemical components. The results indicated that: ① the phosphorus content of domestic main tobacco areas ranged from 0. 25% to 0. 66% with the mean of( 0. 43 ± 0. 08) %,the phosphorus content of Zimbabwe ranged from 0. 45% to 0. 67% with the mean of( 0. 53 ± 0. 05) %; ② the order of the phosphorus contents in flue-cured tobacco leaves among different areas was Zimbabwe( 0. 53%) Southeast tobacco area( 0. 49%) the upper and middle Yangtze River tobacco area( 0. 45%) Southwest tobacco area( 0. 42%) the Yellow and Huai River tobacco area( 0. 41%) North tobacco area( 0. 39%),and the differences among these areas reached extremely significant level; ③ the phosphorus contents increased with the rise of stalk position,and there was no significant difference among different positions; ④ the phosphorus content in flue-cured tobacco leaf had significant or extremely significant positive correlation with nicotine,potassium and chlorine contents,and had extremely negative correlation with total sugar,reducing sugar content and nitrogen / nicotine,sugar / nicotine,but had no significant correlation with total nitrogen and potassium / chlorine; ⑤ the clustering results based on the phosphorus contents and harmonic character evaluation of the chemical components at different phosphorus content levels showed that the flue-cured tobacco leaves with medium and high phosphorus content clusters had proper chemical components,better harmony among indexes and high available value.