Effect of N Nutrition on Yield and Active Ingredient in Blumea balsamifera

The results show that N application will increase the yield of raw material and content of medical active ingredient. 25 kg/667m2 of urea application can reach the peak of biological and raw material yield, 6-10 kg/667m2 of urea application can reach the peak of medical active ingredient content, 20 kg/667m2 of urea application can reach the peak of active ingredient yield. Too much N causes the decrease of yield, active ingredient content, economical coefficient and N availability. N application can also regulate the ratio of L-camphol and the oil in the active ingredient.