Effects of light intensity on growth and yield of lettuce in plant factory system

Abstract

The effects of different of Light Emitting Diodes (LEDs) intensity on growth and yield of lettuce grow in plant factory was compare with outdoor cultivation. The experimental design was 5x2 factorial in CRD, factors 1 was consisting of 5 treatments: 1) White LEDs with intensity of 120 μmolm-2s-1 2) White LEDs with intensity of 140 μmolm-2s-1 3) Mix white red and blue LEDs with intensity of 110 μmolm-2s-1 4) Mix white red and blue LEDs with intensity of 110 μmolm-2s-1 and 5) Sun light with intensity of 1,200 μmolm-2s-1 and factor 2 was lettuce types : green oak and red oak. Lettuce seedlings were transplanted into vertical farming systems in DFT, with a 16-h photoperiod at 24 ๐C and harvesting at 45 days after sowing. The result showed that lettuce grown under plant factory system had significantly the highest mean average leaf width, number of leaf and leaf area of the lettuce as compared with outdoor cultivation. After harvest, the result indicated that outdoor cultivation had significantly the highest fresh weight, dry weight and chlorophyll content. Lettuce types had no significantly different negative growth in the stem green oak lettuce was the highest mean average leaf area, fresh weight and dry weight. While but chlorophyll content was less than the red oak lettuce