Table 1.
Relationship metrics of meteorological variables that are essential to calculating the Water Deficit Index (WDI) as measured by different weather stations at different locations.
| Variables | Number of observations | Source X | Source Y | R2 |
|---|---|---|---|---|
| Solar radiation (MJ m-1 day-1) | 215 | # CRS Pivot | * CRS pivot ground | 0.99 |
| 215 | CRS Pivot | + CRS weather station | 0.99 | |
| 1405 | CRS pivot ground | CRS weather station | 0.99 | |
| 1809 | ! Production pivot 1 | CRS weather station | 0.98 | |
| 1809 | ^ Production pivot 2 | CRS weather station | 0.99 | |
| Wind speed (m/s) | 215 | CRS pivot | CRS pivot ground | 0.90 |
| 215 | CRS pivot | CRS weather station | 0.70 | |
| 1405 | CRS pivot ground | CRS weather station | 0.87 | |
| 1809 | Production pivot 1 | CRS weather station | 0.78 | |
| 1809 | Production pivot 2 | CRS weather station | 0.72 | |
| Relative humidity (%) | 215 | CRS pivot | CRS pivot ground | 0.97 |
| 215 | CRS pivot | CRS weather station | 0.95 | |
| 1405 | CRS pivot ground | CRS weather station | 0.95 | |
| 1809 | Production pivot 1 | CRS weather station | 0.96 | |
| 1809 | Production pivot 2 | CRS weather station | 0.94 | |
| Air temperature (°C) | 215 | CRS pivot | CRS pivot ground | 0.98 |
| 215 | CRS pivot | CRS weather station | 0.96 | |
| 1405 | CRS pivot ground | CRS weather station | 0.99 | |
| 1809 | Production pivot 1 | CRS weather station | 0.98 | |
| 1809 | Production pivot 2 | CRS weather station | 0.97 | |
| Precipitation (mm) | 215 | CRS pivot | CRS pivot ground | 1.00 |
| 215 | CRS pivot | CRS weather station | 0.92 | |
| 1405 | CRS pivot ground | CRS weather station | 0.94 | |
| 1809 | Production pivot 1 | CRS weather station | 0.85 | |
| 1809 | Production pivot 2 | CRS weather station | 0.46 |
The “CRS Weather Station” at the Chillicothe Research Station is a standard weather station, while data was collected using mini weather stations in all other cases.
#ClimaVue 50 mini weather station mounted on the pivot at Chillicothe with sensors at 4 m height from ground.
*ClimaVue 50 mini weather station mounted on the ground in a 90% ET replacement plot at Chillicothe with sensors at 2 m height from ground.
+Standard weather station at the Chillicothe Research Station located about 500 m from the study field with sensors at 2 m height from ground.
!Production Pivot 1 was located about 1.5 km from the standard weather station at Chillicothe.
^Production Pivot 2 was located about 5 km from the standard weather station at Chillicothe.