The aim of this study was to determine the effect of daylength extension treatment using LED lighting (blue, green red, or 3 mixed) on vegetative growth and flowering of freesia, in comparison to glow lamp and metal halide lamp. Lighting treatments were made from 5 PM to 8 PM for 150 days from after...
The aim of this study was to determine the effect of daylength extension treatment using LED lighting (blue, green red, or 3 mixed) on vegetative growth and flowering of freesia, in comparison to glow lamp and metal halide lamp. Lighting treatments were made from 5 PM to 8 PM for 150 days from after flower bud differentiation to total flowers fall. The varieties used were ‘Yvonne’ and ‘Shiny Gold’. For the period from leaf emergence to floral bud formation, no light source affected plant height of ‘Yvonne’, while that of ‘Shiny Gold’ was highest in the metal halide lamp treatment. The number of ‘Yvonne’ was decreased by metal halide lamp, while that of ‘Shiny Gold’ by glow lamp and metal halide. According to a result of SPAD value in flower bud developing period, Chlorophyll Contents of ‘Yvonne’ was the most in metal halide lamp treatment. The time of flowering was advanced in two varieties by blue or green LED treatment compared to no lighting control. The Green LED lighting advanced flowering by 6 and 8 days in ‘Yvonne’ and ‘Shiny Gold’, respectively. The blooming period tended to be shortened in both varieties by the red LED treatment. As for the flower characteristics of ‘Yvonne’, floret length and width were highest in metal halide lamp treatment. The length and weight of the first flower stalk were decreased by glow lamp. In ‘Shiny Gold’, the length of first flower stalk was highest in green LED, Metal halide lamp treatment increased plant height, stem diameter and the length and the weight of first flower stalk, while decreased the number of lateral shoot. Glow lamp treatment increased stem diameter and the first flower stalk weight, red LED increased stem diameter and the first flower stalk length, while the number of lateral shoot the number of lateral shoot the number of lateral shoot. Lighting treatments, especially green LED, increased b-value (yellowness) in ‘Yvonne’ compared to no lighting control. In contrast, lighting treatment decreased the b-value in ‘Shiny Gold’, especially with red LED, glow lamp or metal halide lamp. As for the effect on corm formation, red LED decreased corm width and weight of ‘Yvonne’ while glow lamp decreased height and weight, Starch contents were not influenced in both varieties. In ‘Shiny Gold’, corm width was decreased by blue LED or mixed LED treatment, and starch contents in corm is the highest in the following order: red LED and Green LED, metal halide lamp.
The aim of this study was to determine the effect of daylength extension treatment using LED lighting (blue, green red, or 3 mixed) on vegetative growth and flowering of freesia, in comparison to glow lamp and metal halide lamp. Lighting treatments were made from 5 PM to 8 PM for 150 days from after flower bud differentiation to total flowers fall. The varieties used were ‘Yvonne’ and ‘Shiny Gold’. For the period from leaf emergence to floral bud formation, no light source affected plant height of ‘Yvonne’, while that of ‘Shiny Gold’ was highest in the metal halide lamp treatment. The number of ‘Yvonne’ was decreased by metal halide lamp, while that of ‘Shiny Gold’ by glow lamp and metal halide. According to a result of SPAD value in flower bud developing period, Chlorophyll Contents of ‘Yvonne’ was the most in metal halide lamp treatment. The time of flowering was advanced in two varieties by blue or green LED treatment compared to no lighting control. The Green LED lighting advanced flowering by 6 and 8 days in ‘Yvonne’ and ‘Shiny Gold’, respectively. The blooming period tended to be shortened in both varieties by the red LED treatment. As for the flower characteristics of ‘Yvonne’, floret length and width were highest in metal halide lamp treatment. The length and weight of the first flower stalk were decreased by glow lamp. In ‘Shiny Gold’, the length of first flower stalk was highest in green LED, Metal halide lamp treatment increased plant height, stem diameter and the length and the weight of first flower stalk, while decreased the number of lateral shoot. Glow lamp treatment increased stem diameter and the first flower stalk weight, red LED increased stem diameter and the first flower stalk length, while the number of lateral shoot the number of lateral shoot the number of lateral shoot. Lighting treatments, especially green LED, increased b-value (yellowness) in ‘Yvonne’ compared to no lighting control. In contrast, lighting treatment decreased the b-value in ‘Shiny Gold’, especially with red LED, glow lamp or metal halide lamp. As for the effect on corm formation, red LED decreased corm width and weight of ‘Yvonne’ while glow lamp decreased height and weight, Starch contents were not influenced in both varieties. In ‘Shiny Gold’, corm width was decreased by blue LED or mixed LED treatment, and starch contents in corm is the highest in the following order: red LED and Green LED, metal halide lamp.
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