Table 2.
Soil (clay; soil organic matter, SOM; pH, all at 15-cm soil depth), crop/site (maturity group, season length, day of year—from January 1 to sowing time, and latitude), and weather (precipitation, radiation, temperature, and vapor-pressure deficit, VPD); covariable descriptions: mean, maximum, minimum, range, and unit of observations.
| Parameter | Mean | Min. | Max. | Unit |
|---|---|---|---|---|
| Clay | 30.5 | 23.8 | 34.2 | % |
| SOM | 2.4 | 1.7 | 3.1 | g kg−1 |
| pH | 5.9 | 5.7 | 6.1 | – |
| Maturity group | 2.7 | 2.2 | 3.9 | – |
| Season length | 103 | 96 | 119 | Days |
| Day of year | 145 | 120 | 155 | – |
| Latitude | 42 | 39 | 43 | Decimal degree |
| vaPrecipitation | 178 | 97 | 232 | mm |
| vRadiation | 777 | 437 | 909 | MJ m−2 |
| vTemperature | 22.8 | 17.9 | 23.5 | °C |
| vVPD | 0.23 | 0.15 | 0.33 | kPa |
| rbPrecipitation | 292 | 206 | 358 | mm |
| rRadiation | 1,344 | 1,236 | 1,648 | MJ m−2 |
| rTemperature | 22.9 | 22.0 | 24.7 | °C |
| rVPD | 0.45 | 0.38 | 0.85 | kPa |
a
Observations from vegetative period (VE-R1, excluding flowering).
b
Observations from reproductive period (R1–R7).