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N, K, Ca의 한정된 이온센서 이용을 전제로 한 순환식 수경재배에서 P, Mg의 조절 방법
최경이(Gyeong Lee Choi),여경환(Kyung Hwan Yeo),이한철(Han Cheol Rhee),이성찬(Seong Chan Lee),이중섭(Jung-Sup Lee),강남준(Nam Jun Kang),김학진(Hak Jin Kim),정대현(Dae Hyun Jung) 한국원예학회 2016 원예과학기술지 Vol.34 No.6
Recycling nutrient solutions in closed hydroponic production systems is usually accompanied by an imbalance of nutrient solutions when concentration is controlled according to electrical conductivity (EC) levels. This study investigated whether it was possible to automatically control the concentrations of five essential elements nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) using only N, K and Ca ion sensors. N, P, K, Ca, and Mg uptake was measured in the nutrient solution, and relationships between absorbed ions were analyzed through twice-repeated experiments in lettuce. Results confirmed that the pattern of PO₄ ion uptake was similar that of N, and the pattern of Mg ion uptake was similar that of Ca. PO₄ ion uptake was most highly correlated with N, and Mg was most highly correlated with Ca. Regression coefficients of N and PO₄ were significantly different at 1.04 and 0.55, respectively, but were similar between Ca and Mg at 0.35 and 0.40, respectively. Additional experiments were conducted to measure nutrient uptake in pak choi and rose plants, both to confirm the results from the first experiment in lettuce, and to assess possible application to other crops. Coefficients of determination both for N and PO₄, and Ca and Mg were considerably high (R² = 0.86) in cultured pak choi, and similar results were observed in cultured rose (R² = 0.87 and 0.73, respectively). Regression coefficients for cultured pak choi were 0.56 and 0.24, respectively, and for rose were 0.51 and 0.16, respectively. Although the results obtained for N and PO₄ were not consistent between the lettuce experiments, N and PO₄ have similar regression coefficients for all crops. No common coefficient was found between Ca and Mg.