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Automated Sensing and Control of Hydroponic Macronutrients Using a Computer-controlled System

文献类型： 会议论文

第一作者： Dae Hyun Jung

作者： Dae Hyun Jung 1 ; Hak-Jin Kim 1 ; Won Kyung Kim 1 ; Chang Ik Kang 2 ; Gyeong Lee Choi 3 ;

作者机构： 1.Dept. of Biosystems and Biomaterals Engineering, College of Agriculture and Life Sciences,Seoul National University, Seoul, Korea

2.Science Lab Center Co., ltd, Daejeon, Korea

3.Vrotected Horticulture Research Station, National Institute of Horticultural Herbal Science, Rural Development Administration, Busan, Korea

关键词： Ion-Selective Electrode;Hydroponic nutrients;Macronutrients;Control;Injection time;Lettuce solution

会议名称： Annual International Meeting of the American Society of Agricultural and Biological Engineers

主办单位：

页码： 1479-1484

摘要： A recirculating hydroponic system based on EC-control is not efficient in managing the composition of individual ions in the solution, thereby resulting in a high increase in total concentration of the nutrients and an imbalance of the nutrient salts.This study reports on the development and evaluation of a computer-controlled system with an array of ion-selective electrodes (ISEs) and four diaphragm pumps for direct measurement and individual control of macronutrients in recirculating hydroponic solutions. The ability of three PVC membrane-based ISEs for simultaneous determination of N03-, l\, and Ca2+ ions in the closed soilless system was evaluated. A computer program was developed with Nl LabVIEW, which could calculate the volumes of individualnutrient stock solutions to be supplied based on real-time measurements of N03-K-Ca ions, and vary the injection times of the metering pumps working at constant injection rates. A performance test of the developed sensing and control system was conducted by varying the concentrations of macronutrients in original lettuce solution contained in a hydroponic tank. The results showed that the N03-K-Ca ISEs exhibited satisfactory performance in measuring nutrient concentrations in hydroponic solution and the target concentrations were prepared as expected when using the automated nutrient management system, showing linear relationships with high determination coefficient of >0.9 between the ISE- dosing methods and standard analyzers.

分类号： S-532

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