Nitrogen nutrition plays a crucial part in the growth and quality formation of flue-cured tobacco,which has become an hotspot issues in tobacco cultivation, thus more attention be given by foreign and domestic experts in this field. .This experimental material was CB-1 which was the main tobacco variety in Fujian province, China. The physiological characteristic and nitrogen metabolism in different leaf-position of CB-1 within different nitrogen rates were studied. which aimed at looking for the sui...