| Variable | Time period | Value (range) | Units |
|---|---|---|---|
| precipitation | 1993 – 2016 | 308 (161 – 545) | millimeter |
| air temperature | 1993 – 2016 | 23.6 (15.5 – 31.7) | degree Celsius |
| Crop | Years grown |
|---|---|
| wheat | |
| maize |
| Variable | Material | Units | Frequency | Scale | Comment |
|---|---|---|---|---|---|
| grain yield trait | All crops | annual | |||
| nitrogen content | All crops | annual | in grain and straw | ||
| composition of soil | Soil | sampled sometimes |