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Estimating ec and ionic ec contribution percentage of nutrient solution based on ionic activity

International Journal of Agricultural and Biological Engineering 2019年第2期12卷 42-48页

作者： Jinxiu Song Lin Xu Dongxian He Satoru Tuskagoshi Toyoki Kozai Yutaka Shinohara Key Laboratory of Agriculture Engineering in Structure and Environment of Ministry of Agriculture and Rural Affair China Agricultural UniversityBeijing 100083China Chiba University KashiwaChiba 277-0882Japan Japan Plant Factory Association KashiwaChiba 277-0882Japan

The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high *** to the difficulty of dynamic control based on ionic concentration of nutrient solution,ec and pH values of nutrient solution are often used as feedback control indexes in hydroponic *** this study,estimation algorisms of ec and ionic ec contribution percentage based on ionic activity were proposed to understand the quantitative relationship between ionic concentration and *** a view to predicting the ec accurately by mean ionic activities of specific salts in nutrient solution based on a specific formula,ionic concentration could also be calculated by the actual measurement of ec combined with ionic ec contribution *** Japanese horticultural experimental nutrient formula and Yamasaki tomato nutrient formula,significant linear correlations between estimated ec and measured ec were found with determination coefficients over *** ec contribution percentage was not affected by different relative concentrations of nutrient ***,ionic ec contribution percentage changed significantly when adding specific salts with different concentrations,and different changes were found in each anions and cations of specific salt *** the same K+concentration was added in different forms of KNO_(3),K_(2_SO_(4),KCl,and KH_(2)PO_(4),the changes of ionic ec contribution percentage of K^(+)were similar,but those of other anions in potassium salts varied *** relative errors of estimated ec of nutrient solutions based on ionic activities were only 1.3%in horticultural experimental nutrient solution and 1.8%in Yamasaki tomato nutrient solution with different relative concentrations compared to measured *** relative errors of estimated ec of nutrient solutions with specific salt added were only 0.1%-0.5%compared to measured ec in two nutrient solution.T

关键词： hydroponics nutrient solution ionic activity soilless culture Debye-Hückel limiting equation ionic ec contribution percentage nutrient formula solution dynamic control

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