| 摘要 |
Device for the metered supply of a liquid fertilizer or nutrient to irrigation water in a pipe (8) for hydroponic cultivation, said pipe having a branch (24) with a pump (52) for pressurising branched-off water a number of injection channels (82a..82h), each connected to the delivery side of said pump (52), and each having a widened part (83a..83h) at the position of which an individual metering liquid supply channel (86a..86h) connected to a metering liquid supply (32a..32h) opens out with in series in each metering liquid supply channel a flowmeter (64a..64h), a non-return valve (66a..66h) and a metering valve (68a..68h), in which each metering valve (68a..68h) and the corresponding flowmeter (64a..64h) are connected to a measuring and control unit (44) for pulsed control of the opening of the relative metering valve (68a..68h) the respective outlets (36a..36h) of the injection channels (82a..82h) opening into the irrigation water pipe downstream of the branch (24). <IMAGE> |
