養液イオン濃度調製プログラムを使用したキュウリの栽培 Hydroponic Culture of Cucumber Using the Software for Automatic Ion Control of Nutrient Solutions
Using the developed software for the automatic ion control of nutrient solution ('IonAdjuster'), the hydroponic culture of cucumber (Cucumis sativus L.) was carried out. It was compared with the practical culture managed by EC value of the nutrient solution. In the ion concentration control method using 'IonAdjuster', each ion concentration of NO<SUB>3</SUB>-N, NH<SUB>4</SUB>-N, PO<SUB>4</SUB>-P, K, Ca, Mg could be maintained around the set value except for a short while. In the EC control method, each ion concentration greatly fluctuated, this meant it shifted considerably from the initial value in the later stage of cultivation, and the ionic balance also collapsed. The value of pH decreased gradually as usual in the cucumber solution culture, however, adding the pH stabilization routine to the ion concentration control method could solve it. Though there was a little difference in early yield and total yield between the two methods, the first class fruit rate rose about 15% in the ion concentration control method, and the marketable yield also increased. In addition, the system using 'IonAdjuster', there are also some effects of environmental loading reduction by decreasing waste nutrient solution at renewal, fertilizer reduction, and labor saving of solution preparation, so it seems to be useful.
植物工場学会誌 13(2), 104-109, 2001-06-01
JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS