Changes of chlorophyll fluorescence kinetics in water spinach after applying quinhydrone in soil

Pot experiment of the effects of chlorophyll fluorescence kinetics on water spinach after applying quinhydrone in soil was conducted．The results show that application of quinhydrone in soil can increase the content of chlorophyll in leaves，enhance the potential activity and primary conversion of light energy of PSⅡ in leaf，promote the biological yield．The proper amount of quinhydrone is 40 mg per kilogram soil.