During propagation an atmosphere enriched with carbon dioxide at a nominal concentration of 1000 vpm (~1000 ppm) increases plant vigor and early fruit set and may partly compensate for poor light conditions. The beneficial effects of carbon dioxide enrichment are more evident when air temperatures are on the high side and are proportional to the duration of enrichment. Apply carbon dioxide during the day or any part of the night when artificial light is supplied. Because raising transplants occupies only a small area, it is economically feasible and highly advisable to use liquid carbon dioxide (carbon dioxide gas liquefied under pressure) because of its guaranteed purity and amenity to accurate concentration control. Liquid carbon dioxide is also preferred because burning natural gas or propane to generate carbon dioxide increases the risk of plant injury from gaseous pollutants.
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