Table 5 Biophysical variables used in the construction of the yield attainment model
Variable | Definition | Source |
|---|---|---|
GDD | Growing degree days, Tbase = 0°C for all crops | WorldClim V2.1 (ref. 63) |
MAP | Mean annual precipitation | WorldClim V2.1 (ref. 63) |
PCI | Precipitation concentration index | |
IRR | Fraction of area equipped for irrigation | |
AWC | Available water capacity in the upper 30 cm of soil | ISRIC65 |
SOC | Soil organic carbon in the upper 30 cm of soil | ISRIC65 |
PH | The pH of the upper 30 cm of soil | ISRIC65 |
SLOPE30 | Proportion of area with slope >30° | Harmonized World Soils Database67 |
VF | Vernalization factor, binary used for wheat only; 1 if −8 ≤ Tavg ≤ 5 °C, where Tavg is the average temperature of the coldest month | WorldClim V2.1 (ref. 63) |
t | Year |
