Effects of Ecological Factors on Chemical Components of Tobacco Leaves in Guizhou

Correlations were studied between chemical components of tobacco leaves and ecological factors,including altitude,meteorological factors,and soil nutrients of Guizhou tobacco production regions.The results indicated that the contens of total sugar and chlorine increased,while nicotine decreased in middle and upper leaves with the increasing altitude.Among the meteorological factors,the sunlight hours in June,precipitation and temperature in July were among the most significant.Whereas there exsisted positive correlations between the content of nitrate nitrogen and the levels of nicotine,total nitrogen and protein in upper tobacco leaves,which also held true between the content of active potassium in soil and potassium level in middle and upper tobacco leaves.