Calculation of carbon dioxide emissions from lettuce cultivated with different light quality

Calculation of carbon dioxide emissions from lettuce cultivated with different light quality

The effect of different light qualities on CO2 emission in cultivated lettuce（Lactuca sativa L.）was calculated by using 11 different light qualities（red, blue, white, UV-365, UV-385, and far-red）, with a light quantity（BPFD, range: 300-800 nm）of 200 µmol m-2 s-1 . The environment was set as follows: day/night temperature 24/22 °C, RH 85 %, CO2 concentration 1200 ppm, and photoperiod 16/8 hours. Cultivation was carried out for 42 days using Yamazaki's nutrient broth formulation with a conductivity of 1.2 mS/cm and a pH value of 5.5-6.0. Fresh weight, anthocyanin content, electrical energy yield （EY , g/kWh）and photon yield（PY , g/mol）, anthocyanin electrical energy yield （ EYA , g/kWh）, anthocyanin photon yield（PYA , g/mol）, and benefit-to-cost ratios（pcr）were collected and analyzed. The study was designed by a team of researchers from NPUST with farmers, and the results will be disseminated to the students of FSVS, so that this study can be extended to other fields.