A method for calculating the ion EC contribution rate and conductivity of a nutrient solution on the basis of ion activity so as to inversely calculate each ion concentration of a nutrient solution by using an actual measurement of conductivity and ion EC contribution rate. The method can not only be used for calculating the conductivity and pH of a nutrient solution having a specific formula, but may further be used to provide the theoretical foundation and technical support for dynamic regulation and control on the basis of ion concentration, which is difficult to achieve for a nutrient solution in a soilless culture in a facility, by inversely predicting each ion concentration by using an actual measurement of the conductivity of the nutrient solution. The method is simple, easy to implement, and very accurate, and may be used for developing nutrient solution regulation and control systems, thereby achieving the automatic control of smart matching requirements and formula adjustment between the intended EC and pH of a nutrient solution and each ion concentration for different crops in different growing stages.
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