| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus for circulation-type hydroponics, capable of suppressing the influence on the growth of a crop to the minimum even when a concentration and a balance of components in a culture liquid becomes unsuitable, capable of achieving the control of feed liquid according to biological physiology, and capable of optimizing the absorption of nourishing water by the crop by keeping the state of the water content in a cultivation mat constant. <P>SOLUTION: The apparatus 1 for the circulation-type hydroponics is constituted so that a standard time may be automatically set in relation to the time at which solar radiation intensity is maximum. A new culture liquid is regulated so as to be fed to the cultivation mat 5 before the standard time, and a circulation liquid is regulated so as to be fed to the cultivation mat 5 after the standard time. <P>COPYRIGHT: (C)2004,JPO |
