As the first step of the studies on the effect of the physical and chemical properties of electrolytic water on the growth of soilless culture plant, the five kinds of electrolytic water such as low and high cathode water, low and high anode water, and mixed water which is the volume ratio of cathode water vs. anode water is 1 : 1 were obtained by two electrolytic voltages, and their properties were measured and evaluated.
The measured properties were as follows : pH, oxidation reduction potential (ORP), electric conductivity (EC), surface tension (ST), and dissolved oxygen (DO). The relationships between electrolytic voltage and pH or ORP, and between each pH and ORP of above mentioned five kinds of electrolytic water were evaluated, and then the variances of the values of pH and ORP of each electrolytic water were measured.
The values of pH and ORP of cathode water were increased, those of anode water were decreased and those of mixed water were slightly increased with increase of the electrolytic voltage, respectively. Each relationship between pH and ORP of the three kinds of electrolytic water was as follows : the ORP of anode water was linearly decreased, that of cathode water quickly decreased till halfway since slightly decreased, and that of mixed water early and quickly increased afterwards slightly increased and again quickly increased at last with increase of pH, respectively. Both values of pH and ORP were early and steeply varianced but afterwards convergented to those of control (well-water).