Effect of N combined with K fertilizers on the quality of Platycodon grandiflorum (Jacq.) A. DC.

[Objective] To study the effects of N combined with K fertilizers on the quality of Platycocon grandiflorus(Jacq.) A.DC.,so as to provide basic data for the cultivation of Platycodon grandiflorum(Jacq.)A.DC.[Method] The field experiment was carried out with randomized block design.[Result] When the N fertilization rate ranged from 0 to 210 kg/hm2 and the K application rate from 0 to 315 kg/hm2,the content of polysaccharide and total saponin in Platycodon grandiflorum(Jacq.)A.DC.showed rise trend with the increase of application amount,which reached the highest levels with 210 kg/hm2 N fertilizer combined with 315 kg/hm2 K fertilizer,being 22.08% and 8.73% respectively.[Conclusion] Reasonable application of N combined with K fertilizers is favorable for improving the quality of Platycodon grandiflorum(Jacq.)A.DC.,and this study would provide basis for the cultivation of Platycodon grandiflorum(Jacq.) A.DC..