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[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.
[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: IIPSII; 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.