earticle

영어

The growth of two lettuce were investigated under four different planting distances (15×10, 15×15, 15×20, and 15×25cm) in a plant factory system. Under lighting conditions of 12h/day, the temperature was kept in the range of 20-2 5℃. The CO2 concentration and relative humidity were 600-900 μmol∙mol-1 and 65-75%, respectively. For all planting distances, number of leaves was not significantly different. Shoot fresh and dry weights per plant of two lettuce were not significantly different, however, shoot fresh and dry weights per area decreased with increasing planting distances. Based on the results, we suggest a planting distance of 15×10 cm for maximal growth and yield of two lettuce cultivar in a plant factory.