Warming also decreased seed yield by 45.0% (P < 0.05) and reduced the harvest index by 41.0% (P < 0.05). Although warming decreased the 100-seed weight by 20.8% (P < 0.05), there were no significant differences in other yield components (plants per m2, pod number per plant, seed number per plant, and seed weight per plant) between the warming and the control treatments (Table 1).