不同LED光照强度对菜心生长及品质的影响

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

本试验以菜心为材料,采用营养液栽培方法,通过LED调光台设置四种光照强度(150、250、350、450 μmol?m?2?s?1,分别标为T1、T2、T3、T4)对菜心生长和品质的影响。结果表明:随着光照强度的增高,各处理菜心的地上部鲜重、地下部鲜重、地上部干重、地下部干重、株高、茎粗、叶片数呈现先升高后降低的明显趋势,T3处理最大并且显著大于其它3个处理。菜心的叶绿素含量随着光强增加呈现先升高后降低的趋势,而类胡萝卜素则反之。随着光照强度的增高,菜心产品器官的Vc含量呈现先增高后降低的明显趋势并以T3达最高,可溶性蛋含量逐渐升高并以T4最高。可溶性糖含量呈现先增高后降低的明显趋势并以T2最高T3次之,且各处理间差异显著。菜心的硝酸盐含量随着光强的增高而显著降低。综合生长和品质,菜心全人工光LED栽培最适宜的光强为350 μmol?m?2?s?1。

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. Synthe-sizing growth and quality, the most suitable LED light intensity for plant factory cultivation of flowering Chinese cabbage was 350 μmol?m?2?s?1.