Reduction in Yield of Winter Wheat Caused by Droughts and Its Water-yield Relationship
CAO Cheng
TANG Guangmin
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.
Keywords：droughtyield rulerelation modelwinter wheat
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 13-17 )