"As illustrated in Figure 1 (below) , elevated CO2 enhanced the root, stem and leaf biomass in the daytime only (DeCO2) and day and night (DNeCO2) CO2 treatments
such that their total plant biomass was 40% and 113% greater than that observed in the ambient treatment.
In contrast, nighttime only CO2 enrichment had no effect on any of these parameters, which is of little surprise given that the photosynthesis process requires sunlight.
" ... Shi et al. (2021) write "as atmospheric
CO2 is the primary source of carbon (C) for plants, the ongoing
increased CO2 will act as a C fertilizer,
resulting in an increase in biomass production in cereal crops, vegetable crops, perennial fruit crops, grass, and some perennial woody plants," citing multiple studies in support of this statement.
... Shi et al. report "the amounts of leaf N, P, K, Ca, Mg, Mn, B, Cu, Fe and Zn were significantly increased under either [the] DeCO2 or DNeCO2 [treatments]" ...
... elevated atmospheric carbon dioxide exposure "improves plant growth and leaf quality of mulberry seedlings."
... seven scientists evaluated the growth response of mulberry (Morus alba, cv. Gui-sang-you 62) seedlings to different day and night combinations of CO2 enrichment.
The four treatments included different daytime (0730-1930 hrs)
and nighttime (1930-0730 hrs) levels of CO2 exposure, including
(1) an ambient treatment of 410 ppm during the day and 460 ppm at night,
(2) daytime only elevated CO2 (abbreviated DeCO2) with daytime CO2 elevated to 710 ppm,
(3) nighttime only elevated CO2 (abbreviated NeCO2) with nighttime CO2 elevated to 760 ppm, and
(4) full elevation of CO2 during day and night hours (abbreviated DNeCO2) with daytime and nighttime CO2 elevated to 710 ppm and 760 ppm, respectively."
