[Effects of applying controlled-release compound fertilizer on Platycodon grandiflorum growth].
A pot experiment was conducted in 2008 to study the effects of applying controlled-release compound fertilizer (N:P2O5:K2O = 14:14:14) on the growth of Platycodon grandiflorum in the medicinal herbal farm of Shandong Agricultural University. Comparing with the application of common compound fertilizer (N:P2O5: K2O=15: 15: 15), applying equivalent amount of the controlled-release fertilizer increased the leaf chlorophyll content, root volume, root activity, and root diameter of P. grandiflorum at the late growth stage, but decreased the root length. When the N application rate was 0.24 and 0.32 g x kg(-1) soil, applying the controlled-release compound fertilizer increased the root yield by 26.78% and 22.50%, and the root soluble sugar, protein, and total saponin contents by 9.77% and 6.99%, 11.38% and 2.20%, and 8.85% and 5.47%, respectively, compared with applying the common compound fertilizer. More nitrogen application made the root soluble sugar content decreased but the total saponin content increased. Under our experimental condition, applying the controlled-release compound fertilizer with an application rate of 0.24 g N x kg(-1) soil could obtain the best effect for P. grandiflorum.
College of Agronomy, Shandong Agricultural University, Tai'an, China. zhulix1965@163.com
Li-xiang
LX
Zhu
Jian-hua
JH
Wang
D000383:Agriculture / Q000379:methods; D018533:Biomass; D003692:Delayed-Action Preparations / Q000494:pharmacology*; D005308:Fertilizers; D009584:Nitrogen / Q000494:pharmacology*; D010758:Phosphorus / Q000494:pharmacology; D031238:Platycodon / Q000254:growth & development*; D011188:Potassium / Q000494:pharmacology
D003692:Delayed-Action Preparations; D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium