| 摘要 |
PURPOSE: To smoothly recover excessive liquid fertilizers infiltrated in soil and to safely and efficiently cultivate plants. CONSTITUTION: A porous pipe is disposed in the ground of a lower layer to a part where a pipe for liquid fertilizer supply is disposed, a sterilization processing is performed to the liquid fertilizer recovered by the porous pipe, the sterilized liquid fertilizers are fed to a filtering device and foreign matters such as soil and small stones, etc., are removed. The liquid fertilizers processed in such a manner is neutralized by adding sodium thiosulfate, hydrated by water supplied from a hydration pipeline 36 further and supplied to a storage tank 35. For the liquid fertilizers stored in the storage tank 35, a pH value or the density of nutrients is measured by a sensor means 39, pH adjustment and the selective addition of the respective nutrients are performed by an injector 34 for adjustment based on the measured values and they are supplied from the pipe 6 for the liquid fertilizer supply to natural lawn. |
