Effects of Rooting Agents on Growth and Photosynthetic Traits of Sudan Grasses

摘要

[Objective] To investigate the effects of rooting agents on the growth and photosynthetic traits of Sudan grasses.[Method] The responses of the growth and some photosynthetic traits of Sudan grasses to three NK II rooting agents were determined according to the randomized complete block design.[Result] Compared to control treatment,the Sudan grass treated by NK II-298 showed higher chlorophyll a and carotenoid contents,higher chlorophyll fluorescence parameter values(PSII quantum efficiency:PSII;photochemical quenching:qP;and electron transport rate:ETR),higher maximum photosynthetic rate(Pmax) and respiration rate(Rd),and the highest biomass accumulation.The chlorophyll fluorescence parameter values of Sudan grasses treated by NK II-888 and NK II-16 were higher than those of control treatment(P < 0.05),and other indexes had no significant difference.[Conclusion] The rooting agents should be selected carefully according to their practice aims because of sensibility of Sudan grass to rooting agents.