桔梗营养生长期N、P、K含量的变化

Contents change of N,P,K during the vegetative growth in platycodon grandiflorum

对1年生桔梗营养生长期农艺性状和N、P、K积累的动态进行了调查,结果表明:在本地区,桔梗营养生长盛期为8～9月;在生育初期体内全N,全P,全K含量高于后期,因此桔梗需施底肥,且后期吸肥量明显降低。

Agronomy characters and N,P,K contents of annual platycodon grandiflorum during its vegetative growth were investigated. The results showed that its rapid vegetative growth was in August and September in this area. The contents of total N, total K and total P in earlier stage were higher than the contents in latter stage,so it needed fast fertilizer in earlier stage and its fertilizer absorbed reduced greatly in latter stage.