Change of Phosphorus Content in Flue-cured Tobacco During Development

The changes of phosphorus contents in flue-cured tobacco leaves from different stalk positions (upper, middle and lower) during development were studied. The results indicated that phosphorus content increased with the rise of stalk position and decreased with the increase of leaf age; the difference of phosphorus content between leaves from different stalk positions was not significant, while that between different leaf ages was significant.