| 摘要 |
PURPOSE:To simplify a liquid fertilizer supplying operation and facilitate the control of the concentration of hydroponic solution, by connecting a 1st liquid fertilizer pipe and a 2nd liquid fertilizer pipe spacing an interval to a suction- side pipe of a circulation pump for circulating the hydroponic solution. CONSTITUTION:A water-feeding pipe 44 is connected through a by-pass pipe 50 to a suction-side pipe 19 of a circulation pump 10. A 1st liquid fertilizer pipe 40 and a 2nd liquid fertilizer pipe 43 are connected to the suction-side pipe 19 interposing the connection part of the by-pass pipe 50 between the fertilizer pipes. The 1st liquid fertilizer and the 2nd liquid fertilizer are intermittently introduced into the suction-side pipe 19 in such a manner as to enable the supply of water during the pause of introduction. The process enables the prevention of the precipitation of the components of the 1st liquid fertilizer and the 2nd liquid fertilizer and the non-uniform dilution of the hydroponic solution. |
