The effect of LED light quality on the growth and development of lettuce (Lactuca sativa var cricpa L.) in floating culture system

LED lights are an effective light source for plant growth. In order to recognize the effect of LED light quality on growth and development of red salad bowl cultivar of lettuce, an experiment was conducted at Shahid Chamran University of Ahvaz during 1396 in a randomized complete block design. The test treatments consisted of: blue (B), red (R), white (W), red: blue (RB) ratio (1: 4), red: blue: white (RBW) ratio (1: 1: 4) LED light and fluorescent (FL) (as a control). This experiment was carried out in a floating culture with Resh nutrient solution (Resh, 2005) with a light exposure period of 6 hours of light and two hours of darkness (3 cycles per day) at 24 ± 2 ° C and a relative humidity of 65 ± 5% and photosynthetic photon flux densities of 250 μmol m-2s-1 was performed by The LED illumination in the growth chamber for 35 days after transplantation. The results of the experiment showed that the effect of different light treatments on the leaf fresh and dry weight, stem fresh weight and weight per plant were significant at 5%, but stem dry weight, leaf number, the fresh and dry weight of root at 5% was not significant. The highest and lowest number of leaves were observed in B (45) and RBW (38) light respectively. The highest and lowest weight per plant were observed in W (259.1 gr) and RBW (159.6 gr), respectively.

کلیدواژه ها:

Light ، Biomass ، Red salad bowl