Effects of Different LED Light Intensity on Growth and Quality of Flowering Chinese Cabbage

In this experiment, flowering Chinese cabbage was cultivated with nutrient solution to study the effects of 4 LED light intensities (150, 250, 350, 450 μmol∙m−2∙s−1, labeled as T1, T2, T3 and T4) on the growth and quality. The results showed that, with the increase of light intensity, the shoot fresh and dry weight, the root fresh and dry weight, the plant height, the stem diameter and the number of leaves showed a trend of increasing first and then decreasing. And T3 treatment was the largest and significantly greater than the other 3 treatments. The chlorophyll content of the flowering Chinese cabbage leaf increased first and then decreased with the increase of light intensity, while carotenoids showed the opposite tendency. With the increase of light intensity, the Vc content of the product organs in flowering Chinese cabbage increased first and then decreased, and reached the highest level in T3. The soluble protein content increased gradually and reached the highest level in T4. The soluble sugar content increased first and then decreased, with the highest content of T3 and the second of T2, and the differences among the treatments were significant. The nitrate content of the flowering Chinese cabbage decreased significantly with the increase of light intensity. Synthesizing growth and quality, the most suitable LED light intensity for plant factory cultivation of flowering Chinese cabbage was 350 μmol∙m−2∙s−1.