Abstract
In order to explore the impacts of drought occurred in single development stage and two development stages respectively on grain formation and yield of maize,the grain formation and yield were simulated by WOFOST under different drought grades in seedling stage and jointing stage. The drought grades were indicated by the number of norain days. The results showed that 10 d to 40 d continuous drought occurred in single development stage affected on grain filling and yield formation. The longer the drought period was,the larger yield reduction rate got. The reduction rate was 3. 24% and 3. 5%,7. 89% and 8. 31%,12. 33% and 13. 71%,21. 6% and 23. 94% when continuous drought for 10 d,20d,30 d and 40 d,occurred in the seedling stage and the jointing stage,respectively. The yield reduction rate was 1. 77%,9. 02%,18. 93% and 31. 28% when continuous drought for 5d,10 d,15d and 20 d occurred both at seedling stage and jointing stage. The results indicated that yield reduction was more significant when drought occurred at the jointing stage than that at the seedling stage. The reduction rate under the simultaneous drought both seedling stage and the jointing stage was higher than the sum of drought at individual development stage. The results could provide scientific basis for maize planting and drought disaster mitigation in Southwest China.
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