关键词: 植物工厂, 日累积光照量, 光能利用效率, 壮苗指数, 工厂化育苗

Abstract: In order to cultivate highquality tomato seedlings and reduce the energy consumption of industrial seedling, tomato (Solanum lycopersicum Mill.) (cv. “Zhongza NO.9”) was used as the experimental material to study the effects of light intensity and light duration, the effects of DLI and sowing density on the seedling quality of tomato in a controlled environment, and energy consumption was also analyzed in this paper. The results indicated that the biomass accumulation, rootshoot ratio and healthy index of tomato seedlings were significantly increased with the increase of DLI, but there was no significant difference in biomass accumulation and energy consumption between tomato seedlings with DLI of 15.12 mol/(m2·d) and 12.96 mol/(m2·d). The stem diameter, leaf number, leaf area, net photosynthetic rate and healthy index of tomato seedlings with the same DLI treatment decreased gradually because of the increase of sowing density. However, there was no significant difference in shoot fresh weight, shoot dry weight, root fresh weight, root dry weight and total dry weight of tomato seedlings between D15.12-50K, D12.96-50K and D15.12-72K. Therefore, increasing DLI can reduce the poor seedling quality caused by excessive sowing density to a certain extent, and improve the spatial utilization efficiency and light utilization efficiency of tomato seedling. In summary, it can be believed that the DLI with 15.12mol/(m2·d) (the light intensity is 300μmol/(m2·s), and the light duration is 14 h/d) and the sowing density with 72 cell per plug tray is more conducive to cultivating highquality tomato seedlings, and the energy consumption of seedlings can also be reduced at the same time.

Key words: plant factory, daily light integral, light use efficiency, healthy index, industrial seedling