| 摘要 |
PURPOSE:To efficiently grow plant by providing culturing pot-laying stages having inside air-compressing chambers in plural water tanks connected with overflow pipes and respectively providing irrigating and impounding level sensors in upper water tanks higher than the lowest stage and the lowest water tank. CONSTITUTION:Air is pressed into air-compressing chambers 6, 6' an 6'' inside of culturing pot-laying stages 3, 3' and 3'' by a blower 14 and water in water-impounding chambers 4, 4' and 4'' is raised to water-raising chambers 5, 5' and 5'' through water- raising paths 17, 17' and 17'', then culturing pots A in the culturing pot-laying stages 3, 3' and 3'' are irrigated from the bottom face. In attaining of water level to an upper limit 18a of an irrigating level sensor set in a part higher than the lowest stage, the blower is stopped and accumulated air in the air-compressing chambers 6, 6' and 6'' is reversely flowed in blastpipes 15, 15' and 15'', then the operation if again performed in attaining of water level to a lower limit 18b of the irrigating level sensor. In lowering of water level to a lower limit 19b of a water impounding level sensor set in the lowest stage, an electromagnetic valve 8 is opened and water is supplied into a water tank 4 in the highest stage from a water-supplying pipe 7, then supplied to lower water tanks through overflow pipes 10, 10' and 10''. A water-discharging solenoid valve 13 is closed during operation of the blower 14 and opened in other case. |
