The raft system is an interesting technique of growing lettuce and other short stature crops. In this method, plants are supported by baskets fit into Styrofoam sheets that float upon a bath of nutrient solution. The nutrient solution is circulated and aerated from below to maintain a high level of dissolved oxygen and avoid stagnation. The raft system is a very economic means of producing large quantities of lettuce and mixed greens in no time.
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