Objective: Experiments were carried out to study the mature seeds of Gentiana rigescens

and the effects of phosphorus on growth and physiological characteristics of G. rigescens seedlings in the floating system were explored. Method: Perlite was mixed with vermiculite

peat

et al

to form the seedling substrate

and the effects of phosphorus on growth and physiological characteristics of G. rigescens seedlings in the floating system were studied by floating nursery law and plant physiology experimental method. Result: The suitable concentration phosphorus was used to treat the seedlings of G. rigescens in the floating system

not only make the seedling plant height

root length

stem and leaf dry weight

root dry weight significantly higher than those not treated with phosphorus (P<0.01)

but also make the leaves chlorophyll content

nitrate reductase(NR) activity and root activity were significantly higher than those not treated with phosphorus (P<0.01). Conclusion: This study ascertained the effects of phosphorus on the botanical characters and physiological characteristics of G. rigescens seedlings in the floating system

and the optimal phosphorus concentration in the floating system nutrient solution of G. rigescens is within the range between 50 mg·L-1 and 100 mg·L-1.