earticle

영어

The study was conducted to investigate the effects of light sources and foliar spray by magma seawater on growth and quality characteristics of cherry tomato (Solanum lycopersicum L.) in a closed-type plant factory system. Three-band radiation type fluorescent (FL) lamps and high-intensity light emitted diodes (LED) with a 12-hours photoperiod were used and the light intensities were 120 μ mol·m-2·s-1 and 343 μmol·m-2·s-1, respectively. ED (electric desalter) mineral water extracted from magma seawater was used and was sprayed one time per week. Nutrient film systems with three layers were used for plant growth. Environmental conditions, The electrical conductivity and pH maintained at 1.5 dS·m-1 and 5.5-6.5, respectively. Temperature and relative humidity inside the plant factory maintained at 20-28℃ and 40-60%, respectively, and carbon dioxide is not controlled. The growth (plant height, number of fruit, fruit diameter, fruit width, flowering date, harvest date, fresh weight and dry weight) and quality (brix, mineral concentration and lycopene content) characteristics and lycopene contents of cherry tomato were analyzed. The plant height, flowering time and harvest date were faster at LED. The number of fruit was more at LED, but was not affected by spray. The fruit diameter showed no significant difference among the treatments. The fruit width was largest at FL and no spray and the fresh and dry weights of fruit were highest at FL and no spray. However the yield and brix were highest at LED and no spray. The lycopene content was higher than that of FL and highest at LED and spray. From the above results, we concluded that the use of LED is better than FL for growth, however, the use of LED and ED mineral is better for quality of cherry tomato in a closed-type plant factory.