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cannabis roots
Posted on 2007-Dec-6 at 08:22 - Post Comment
As long as the roots come in contact with air containing oxygen, their needs are met. A ball valve similar to the ones used in toilets are sometimes used to automate this system. When the water level falls, the valve opens up filling the tray to the desired height. When several trays are being used, the valve sits in its own container and controls the water level of all the other containers. The containers are connected to the central unit using tubes. A constant level of water is maintained. This simple unit is very effective and will produce about the same yield as a sophisticated, water moving system.These simple units increase the time between watering by several days (white widow seeds). They add water to the reservoir only as it is needed.The very first hydroponic units I ever used were wick systems. They consisted of two plastic containers which fit into each other. The bottom of the top container had been drilled and 3¼" thick pieces of nylon cord were strung across the bottom and hung down into the lower container from both sides.
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