Environmental factors

A wide range of environmental factors affects plant growth. Here, 12 of the most important factors are considered.
To analyse the effect of these factors on plant growth in terms of dose-response curves, we need first to define what the relevant range is where actively-growing plants normally have to cope with. These ranges are listed below, as well as the value that serves as reference value in the construction of the dose-response curves.

Environmental Factor Range considered Unit Reference value
1. Irradiance 1 - 50 mol m-2 day-1 8
2. R:FR 0.2 - 1.2 mol mol-1 0.9
3. UV-B 1 - 20 kJ m-2 day-1 7
4. CO2 200 - 1200 Ámol mol-1 400
5. O3 5 - 100 nmol mol-1 20
6. Nutrients 0.02 - 1 rel. Units 1
7. Drought 0.05 - 1 rel. Units 1
8. Waterlogging absent / present - absent
9. Submergence absent / present - absent
10. Temperature 5 - 35 ░C 20
11. Salinity 0 - 1 fraction of seawater 0.1
12. Soil Compaction 1.0 - 1.6 g cm-3 1.2