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Since the growth and development of plants are greatly affected by the different color light and the different plants have various light requirements, it is necessary to carry out the best combination of lightwave for the plants.
Compared with white light, red light and blue light, the LED grow light with red and blue combined light showed the advantage for the growth and development of cucumber and cabbage seedlings. When the ratio of red and blue light is 8:2, the stem diameter, plant height, plant stem, fresh weight and seedling index of the plant are significantly improved, and it is beneficial to the formation of chloroplast matrix, granule layer, and output assimilation product.
Under the treatment of red8:blue1 LED plant light, the plant height, stem diameter, leaf area, seedling index, aboveground and whole plant fresh weight of cucumber seedlings were the highest, and the seedling leaves had the higher POD and APX activities.
The use of red, green and blue light combination for red bean sprouts is conducive to the accumulation of dry matter. The addition of green light promotes the dry matter accumulation of red bean sprouts, and its best light ratio is red6:green2:blue1. The ratio of red and blue light was 8:1, and the hypocotyl elongation of red bean sprouts was the best.
When the red-blue light ratio was 8:1, the loofah seedlings had the highest seedling index and the highest soluble sugar content. When the red-blue light ratio was 6:3, the content, chlorophyll a/b ratio and soluble protein content were the highest.
It can effectively promote the plant height, petiole length, leaf number, dry matter quality, VC content, soluble protein content and soluble sugar content of celery when the ratio of red-blue light to celery is 3:1.
In tomato cultivation, increasing the proportion of LED blue light promotes the formation of lycopene, free amino acids, and flavonoids. On the other hand, increasing the proportion of red light to promote the formation of titratable acid of tomato.
For lettuce, when the red-blue light ratio is 8:1, it is beneficial to the accumulation of carotenoids, and effectively reduces the content of nitrate and increases the VC content.
It can be seen from the above that different ratios of light colors have different influences on the growth of different crops. It is important to select the best light color ratio of LED plant grow light according to different plants and should be based on the horticultural crop commodity demand, production target, production conditions, etc.
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