METHOD FOR CALCULATING ION EC CONTRIBUTION RATE AND CONDUCTIVITY OF NUTRIENT SOLUTION ON BASIS OF ION ACTIVITY

摘要

A method for calculating an ionic EC contribution percentage and electrical conductivity of a nutrient solution based on an ionic activity is provided, so as to inversely calculate each ionic concentration of the nutrient solution by using the actually measured electrical conductivity and the ionic EC contribution percentage. The method can not only be used to calculate the electrical conductivity and pH of a nutrient solution with a specific formula, but also to inversely predict each ionic concentration using actually measured EC of the nutrient solution. And the method provides a theoretical basis and a technical support for dynamic regulation and control based on the ionic concentration which is difficult to implement for the nutrient solution in greenhouse soilless culture. The method is simple, easy to implement, and very accurate. The method may be used for developing nutrient solution regulation and control systems, thereby achieving automatic control of smart matching demands for the established EC and pH of a nutrient solution and each ionic concentration by different crops at different growth stages and formula adjustment.