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| DOI： |
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| Reduction in Yield of Winter Wheat Caused by Droughts and Its Water-yield Relationship |
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CAO Cheng， TANG Guangmin
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Anhui Province Key Laboratory of Water Resources and Hydraulic Engineering, Anhui and Huaihe River Water Resources Research Institute, Bengbu 233000, China
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| Abstract: |
| Using the Guan 35 winter wheat as a model plant, we investigated the impact of drought on yield reduction in the wheat grown in a lysimeter, as well as its water-yield relationship. The results showed that the yield of the wheat reduced when soil moisture decreased in both its critical and noncritical growth stages. A slight drought reduced the yield by 4.4%, while a moderate and severe drought could lead to a yield reduction by 8.1% and 8.6% respectively when the drought occurred at noncritical growth stage. In contrast, a slight, moderate or severe drought occurring at critical growth stage could give rise to a yield reduction by 6.2%, 6.9% and 11.2% respectively. It was also found that the wheat was more sensitive to water deficit occurring at the jointing and the heading-filling stages, with their associated sensitivity index being 0.175 2 and 0.084 9 respectively, than occurring at the milking and the tillering stages, with their associated index being 0.003 2 and 0.066 2 respectively. The wheat at heading-filling stage, also the highest water-demanding stage, was most sensitive to drought. |
| Key words: drought； yield rule； relation model； winter wheat |
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