Bioponics for lettuce production in a plant factory with artificial lighting
The plant factory with artificial lighting (PFAL) has gained worldwide attention, and the most popular culturing system is hydroponics, in which pure soluble inorganics fertilizers are used. The manufacturing processes of these fertilizers are not environment friendly. A new trend termed bioponics, using organic fertilizers, was brought to our attention. This study aimed to use two organic fertilizers (BIO N and BIO NK, Swiss Hydroponics Lab.) in a deep-flow-technique (DFT) system in a PFAL producing Frill-ice, Boston and Frilly lettuce, with Yamazaki formula (inorganic fertilizer) as the control group. The environmental settings of the PFAL were as follows: photosynthetic photon flux density (PPFD) 200 μmol m-2 s-1, day/night temperature 25/18°C; CO2 concentration 1200 ppm. Our results showed that the control group had the highest fresh mass for Frill-ice lettuce. Bioponics treatments greatly reduced the nitrate concentration of all lettuces and increased the fresh mass of Frilly lettuce. BIO N was not suitable for Boston lettuce. Further studies will be conducted using BIO NK and Frill-ice lettuce. Using organic fertilizer in PFAL looks promising; however, whether or not the products of bioponics can be considered organic is still controversial.
Fang, W. and Chung, H. (2018). Bioponics for lettuce production in a plant factory with artificial lighting. Acta Hortic. 1227, 593-598
bioponics, hydroponics, deep flow technique, organic