| Early detection |
Initial day for observing plant changes (day) |
Differentiate control and CO2 (≥10%) stress treatment |
| 5 |
≤1 |
Y* |
| 4 |
2–4 |
Y |
| 3 |
5–7 |
Y |
| 2 |
8–10 |
Y |
| 1 |
>10 |
Y |
| *Y: The parameters differentiate the control and CO2 stress treatments (P < 0.05). |
| CO2 specificity |
Differentiate water stress treatment from |
| 5 |
CO2 (≥10%) stress and water + CO2 stress*
|
| 4 |
Water + CO2 stress |
| 3 |
CO2 (≥10%) stress |
| 2 |
Control |
| 1 |
N** |
| *The parameters differentiate water stress treatment from compared treatments (P < 0.05); **N: The parameter cannot detect water stress. |
| Field applicability |
Nondestructive |
Remotely detectable |
Automatic monitor |
Continuous monitor |
| 5 |
Y* |
Y |
Y |
Y |
| 4 |
Y |
Y |
Y |
N** |
| 3 |
Y |
Y |
N |
N |
| 2 |
Y |
N |
N |
N |
| 1 |
N |
N |
N |
N |
| *Y: the parameter meets the criterion; **N: the parameter does not meet the criterion. |
| Cost |
Average cost of device and time |
| 5 |
Low* |
| 4 |
Low + medium** |
| 3 |
Medium*** |
| 2 |
Medium + high**** |
| 1 |
High***** |
| *Low: low device (<$5,000) and low time (<3 min). |
| **Low + medium: (1) low device and medium time (4–20 min) or (2) low time and medium device ($5,000–$30,000). |
| ***Medium: (1) medium device and medium time, (2) low device and high time, or (3) low time and high device. |
| ****Medium + high: (1) medium device and high time (>20 min) or (2) medium time and high device (>$30,000). |
| *****High: high device and high time. |
