Analysis of yield and water use efficiency of under-irrigated crops based on meta-analysis
[Objective]In order to comprehensively analyze the effects of deficit irrigation on the yield and water use efficiency of major crops in northern China.[Methods]In this study,meta-analysis was used to quantitatively analyze the changes of crop yield and water use efficiency after deficit irrigation,and subgroup analysis was performed to analyze the changes of different regions,crops,precipitation and irrigation methods.[Results]Insufficient irrigation significantly reduced crop yield in northern China,with an average yield re-duction rate of 6.66%,and the average yield reduction rate in northeast China was the most significant,reac-hing 9.43%.The water use efficiency of crops was significantly improved,with an average improvement rate of 10.59%.The water use efficiency in northwest China was the most significant,reaching 12.70%,while the water use efficiency in northeast China did not improve significantly.The yield of different crops,wheat,corn and cotton,the highest yield reduction rate of cotton was 10.67%,and the water use efficiency was sig-nificantly improved,and the highest increase rate of cotton reached 15.63%.There was a significant yield re-duction effect in different precipitation ranges,and the yield decreased by 10.74%in the 200-400 mm range,but the water use efficiency in this interval did not improve significantly.The yield under traditional ground irrigation,drip irrigation and submembrane drip irrigation were significantly reduced,the yield reduc-tion rate of drip irrigation was up to 8.93%,the water use efficiency was significantly improved,and the WUE improvement rate under drip irrigation was up to 15.95%.[Conclusion]The results show that deficit irriga-tion can significantly improve crop water use efficiency and significantly reduce crop yield,but the effect is dif-ferent under different planting areas,crop species,climatic conditions and irrigation methods.
meta-analysisdeficit irrigationyieldwater use efficiency
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