| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydroponic system of growing crops without using soil, capable of more efficiently cultivating the crops by elevating and maintaining dissolved oxygen concentration in its culture liquid for sufficiently supplying oxygen required for the growth of the roots of the cultivated crops. <P>SOLUTION: This hydroponic system is provided by using a gas-dissolving device 3 for elevating the dissolved oxygen concentration in the culture liquid 1, and maintaining the dissolved oxygen concentration in accordance with the growing periods and growing conditions of the crops to accelerate the growth of the crops. Since the oxygen consumption of the crops changes depending on growth periods, sunshine time, water temperature, etc., while always measuring the dissolved oxygen concentration in the culture liquid 1, the prescribed oxygen concentration in the culture liquid is maintained by regulating the operation of the gas-dissolving device 3. By using the system, regulation and control of the dissolved oxygen concentration in the culture liquid at a level suitable for the growing state of the root parts of the cultivated crops is allowed, and the productivity of the hydroponics is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT |
