| 摘要 |
PURPOSE:To supply a nutrient liquid according to the variation of the circumferential environment, by driving a replenishing water pump to supply a supplementary nutrient liquid to a growth tank in a manner controlled with a control circuit corrected by the intensity of solar radiation and the ambient temperature. CONSTITUTION:A control circuit 3 controls the driving power of a replenishing water pump 2 and the amount of supplementary nutrient liquid according to ambient temperature detected by a temperature sensor 5. The day and night are discriminated by a sensor 4 and the replenishing water pump 2 is made to be operable only in the daytime. When the wind is strong and the solar radiation is intense, the light sensor 4 detects the intensity of solar light and temporarily supplies water to the growth tank. The supply of water is stopped in a cold time to prevent the overflow of the culture liquid from the growth tank 1. |
