| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problems in the circulating use of a culture solution for hydroponic culture such as water culture comprising the difficulty in the control of pH of the solution, the accumulation of unnecessary nutrients and the contamination of the culture solution with pathogenic microorganisms and enable the circulating use of the culture solution, to provide a method for the preparation of the culture solution for hydroponic culture enabling the control of major elements and minor elements necessary for crops and having different requiring amounts according to the kind and the growing stages of the crop, and to provide a method for supplying the minor elements. <P>SOLUTION: A culture solution for hydroponic culture such as water culture is used as an electrolytic solution and directly electrolyzed by passing a DC current with insoluble electrodes to control the pH of the culture solution for hydroponic culture, supply oxygen to the culture solution, remove the accumulated nutrients and sterilize microorganisms to enable the circulating use as the culture solution for hydroponic culture. A metal or alloy composed of a minor element is used as a soluble electrode and the culture solution is electrolyzed by passing superposed DC and AC current to supply the minor element and keep the element concentration within a controlled range. The root area is heated by controlling the distance between the electrodes and the amount of the current. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
