| 摘要 |
A plastic tray having short legs and a perforated bottom fits securely within a plastic container, the tray being adapted for carrying vermiculite and the container being adapted for holding nutrient solution. The tray also has an enlarged upper portion defining a channel-shaped inner ledge between the enlarged and unenlarged portions thereof. An electric pump is disposed within a compartment of the tray, and a plastic tube runs from the pump into the nutrient solution and up the wall of the tray to the channelshaped ledge, into which it snaps along the sides of the tray. The tube is perforated where it contacts the nutrient solution, and has a series of apertures along the portion snapped to the walls of the tray, such that a mixture of air and nutrient solution can be pumped through the tube into the vermiculite. |
