Table 1. Summary of statistically significant maize yield responses (P < 0.1) for a one unit increase in monthly cumulative precipitation and maximum temperature.
| Region-Location | Maximum Temperature | Cumulative Precipitation | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March | April | May | June | July | August | September | March | April | May | June | July | August | September | |
| kg ha−1 oC −1 | kg ha−1 mm−1 | |||||||||||||
| North-Belle Mina | — | 599.5 | — | −1262.4 | — | — | −1089.0 | — | — | — | — | — | — | — |
| North-Blairsville | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Central-Prattville | — | — | — | −735.6 | — | — | 608.9 | — | — | 14.1 | 8.7 | 15.4 | — | — |
| Southcentral-Tifton | 268.4 | — | — | — | −523.5 | — | — | 8.0 | — | 18.7 | 14.5 | −22.1 | — | — |
| South-Fairhope | −759.7 | — | — | — | — | — | — | — | −13.7 | — | — | — | −10.9 | — |
| Southeastern U.S. average | — | — | — | −610.4 | −644.4 | — | — | — | −9.2 | — | 6.3 | — | — | — |
The coefficients were estimated fitting linear regression models between first year differences (year-to-year changes) of yield (kg ha−1), of monthly maximum temperature (left), and monthly cumulative precipitation (right) generated for each of the 5 locations and each of the 7 growing season months from 1981–2013. The number in each cell is the month-specific yearly linear trend and was independently generated by holding constant the variation in all other cells. The location-specific data were aggregated to generate a southeastern US average for the same 7 months. Dashes denote statistically non-significant maize yield responses (P > 0.1).