To study the influences of different nutrient solution concentrations on growth of greenhouse cucumber(Cucumis sativus L.) and substrate environment.A negative pressure water supplying and controlling pot device were used in the experiment to supply nutrient solution,four nutrient solution concentrations are designed in pot experiment,i.e.,0.5S、0.75S、1S、1.25S with 1S Yamazaki cucumber nutrient solution concentration as the standard concentration,and set a CK(1S) treatment which supply nutrient solution by t...