不同光密度对不结球白菜的生长与品质的影响

Effects of Different PPFD on Growth and Quality of Non-Heading Chinese Cabbages

适宜光密度调控是植物工厂化栽培过程中,实现高效、优质生产的关键措施之一。本研究选‘南农1号’(‘NN-1’),‘南农2号’(‘NN-2’),‘南农3号’(‘NN-3’),‘南农4号’(‘NN-4’),‘南农5号’(‘NN-5’)五个品种,采用红蓝比为3:1的LED植物光源,设置150(T150)、200(T200)、250(T250)和300μmol·m-2·s-1(T300)四个光密度处理,研究不同光密度对不结球白菜生长和品质的影响。结果显示,在T200处理中,‘NN-3’和‘NN-4’呈现出最好的生长及品质指标;在T150或T200处理中,‘NN-1’、‘NN-2’及‘NN-5’的生长指标优于T250或T300处理,且T200处理的品质指标优于T150处理;在T300处理中,5个品种都出现生长指标不良、品质指标下降的特征。比较5个不同品种的不结球白菜对光密度的需求,表明200μmol·m-2·s-1的光密度有利于不结球白菜的生长与品质提升,可作为不结球白菜工厂化栽培的光密度参考。

Suitable photosynthetic photon fl ux density（PPFD） controlling is one of the important measures for high yield and excellent quality of cultivation in plant factory. In this study, ＂Nannong-1＂（‘NN-1＇）, ＂Nannong-2＂（‘NN-2＇）, ＂Nannong-3＂（‘NN-3＇）, ＂Nannong-4＂（‘NN-4＇） and ＂Nannong-5＂（‘NN-5＇） were investigated under four PPFD treatments of light emitting diode（LED） grow lights with red/blue ratio of 3：1, to study the growth and quality of five cultivars non-heading Chinese cabbages. Four treatments were 150（T150）, 200（T200）, 250（T250） and 300 μmol·m-2·s-1（T300）. The results showed that the growth and quality of ‘NN-3＇ and ‘NN-4＇ under PPFD of 200 μmol·m-2·s-1 were the best, and the growth of ‘NN-1＇、‘NN-2＇ and ‘NN-5＇ under PPFD of 150 or 200 μmol·m-2·s-1 were better than that of the other treatments, and the quality of plant under PPFD of 200 μmol·m-2·s-1 were better than that under 150 μmol·m-2·s-1. Five cultivars non-heading Chinese cabbages under PPFD of 300 μmol·m-2·s-1 had the characteristics of growth inhibition and quality reduced. By comparing the demands for light of five cultivars non-heading Chinese cabbages, the results indicated that the PPFD of 200 μmol·m-2·s-1 which could promote the growth of non-heading Chinese cabbages and improve their quality, and can be used as non-heading Chinese cabbage cultivation optical density reference in plant factory.