Horizontal air movement is beneficial for several reasons. An approximate air speed of 1 m/s,' which causes leaves to move slightly, is recommended. Horizontal air movement helps minimize air temperature gradients in the greenhouse, removes moisture from the lower part of the greenhouse (under the foliage), distributes moisture in the rest of the greenhouse, helps the carbon dioxide from the top of the greenhouse to travel into the leaf canopy where it is taken up and fixed in photosynthesis, and may even assist pollination. As a result of modest air movement in the greenhouse the uniformity of the greenhouse environment is improved, which is generally beneficial to crop productivity and energy conservation.
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