Based on field experiment,the effect of controlling bolting on yield and quality from root of Notopterygium forbesii was studied in Hezheng County of Gansu.The results indicated that no bolting controlling treatment showed the best.The yield,the content of extraction and the essential oil increased by 67.80 %,2.12 % and 26.19 % from root of N.forbesii compared with the control.However,the worst treatment was getting rid of bolting treatment.The extraction content of treatments above mentioned and the contro...