Study on the Characteristics of Irrigation Requirement of Winter Wheat in Southeast Shanxi Province Areas
In order to optimize the allocation of water resources in the Yellow River Basin and the irrigation regime for winter wheat crops in southeast Shanxi Province areas,based on the meteorological data from 1960 to 2019 in Yangcheng County,the annual changes of water re-quirement and rainfall at different growth stages of winter wheat were analyzed and calculated.In the typical irrigation year(25%,50%,75%and 95%),the coupling analysis of the water requirement and rainfall was carried out,and the irrigation water consumption of the win-ter wheat was calculated.The results show that in the past 60 years,the climate tendency rate of winter wheat water requirement increases with the change of 0.593 mm/(10 a),and the annual average water requirement is 586.09 mm in southeast Shanxi Province areas.The cli-matic tendency rate of rainfall increases by 9.827 mm/(10 a),and the annual average value of rainfall is 213.66 mm.The climatic tendency rate of water requirement of winter wheat is the highest at jointing-heading stage.Under four typical irrigation years(25%,50%,75%and 95%),the coupling degree of rainfall and water demand in the whole growth period of winter wheat is 0.43,0.33,0.28 and 0.18 respective-ly.Natural rainfall cannot meet the water requirement of winter wheat growth.The amount of supplementary irrigation water is 261.74 mm,427.45 mm,554.34 mm and 674.66 mm respectively.Except typical irrigation years of 25%,the amount of supplementary irrigation water is the largest at heading to filling period.The supplementary irrigation water should be 116.87 mm,142.55 mm and 171.54 mm respectively.
winter wheatcrop water requirementrainfallsupplementary irrigation water
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