关键词: 玉簪, 控释氮肥, 生长, 光合特性, 叶绿素荧光

Abstract: Effects of controlled release nitrogen fertilizer(CRNF) on the growth and photosynthetic characteristics of Hosta at different growth stages were studied in this paper using H.ventricosa potted seedlings under 50% shade condition. The results showed as follows: N₁ treatment(4 g CRNF) and N₂ treatment(8 g CRNF) could increase dry weight at different growth stages of Hosta; could significantly increase Chlb content at morphogenesis stage(MS), Chla, Chlb and Car. contents at booting stage(BS) and flowering stage(FS); and could significantly increase P_n at different growth stages of Hosta. F_v/F_m, Ф_PSⅡ, F′_v/F′_m of N₁ treatment were significantly higher than control at BS and FS, F_v/F_m, Ф_PSⅡ, F′_v/F′_m of N₂ treatment were significantly higher than control at MS and FS, while only F_v/F_m at BS. There were no significant differences in qP between all CRNF treatments and control with the except N₁ treatment at MS. NPQ of all CRNF treatments had no significant differences with control at MS, but significantly lower than control at BS and FS.

Key words: Hosta ventricosa, Controlled release nitrogen fertilizer(CRNF), Growth, Photosynthetic characteristics, Chlorophyll fluorescence