Genotypic differences in soybean yield responses to increasing temperature in a cool climate are related to maturity group

- Early- and late-maturing soybean cultivars were grown under three temperature regimes.
- High temperature increased seed weight of late- but not early-maturing cultivars.
- The increase in seed weight resulted from an improvement in sources and sinks.
- Larger sinks were attributed to the longer flowering period which occurred under elevated temperature.