Different Deficit Irrigation Lower Limits and Irrigation Quotas Affect the Yield and Water Use Efficiency of Winter Wheat by Regulating Photosynthetic Characteristics
作者机构：Faculty of EngineeringHuanghe Science and Technology UniversityZhengzhou450000China
出 版 物：《Phyton-International Journal of Experimental Botany》 (国际实验植物学杂志（英文）)
年 卷 期：2023年第92卷第12期
页 面：3211-3236页
核心收录：
基 金：supported jointly by the Natural Science Foundation of China (No.41807041) the Ninth Batch of Key Disciplines in Henan Province—Mechanical Design,Manufacturing and Automation (JGNo.119)
主 题：Irrigation lower limit irrigation quota soil volume moisture content photosynthetic rate yield regression analysis
摘 要：To determine suitable thresholds for deficit irrigation of winter wheat in the well-irrigated area of the Huang-Huai-Hai Plain,we investigated the effects of different deficit irrigation lower limits and quotas on the photosynthetic characteristics and grain yield of winter *** irrigation lower limits were set for initiating irrigation(i.e.,light drought(LD,50%,55%,60%and 50%of field holding capacity(FC)at the seedling-regreening,jointing,heading and filling-ripening stages,respectively),medium drought(MD,40%,50%,55%and 45%of FC at the same stages,respectively),adequate moisture(CK1,60%,65%,70%and 60%of FC at the same stages,respectively),heavy drought(CK2,35%,40%,45%and 40%of FC at the same stages,respectively))and five irrigation quota per event(30,60,90,120 and 180 mm)were set for each lower *** found that the increase of drought stress is conducive to normal photosynthesis of winter wheat leaves which is supported by the following ***,photosynthetic rate(Pn)of LD60 treatment was higher than that of LD30,LD90,LD120,LD180,MD30,MD60,MD90,MD120 and ***,Under the 90 mm irrigation quota treatment,the yield of winter wheat basically increased with the increase of irrigation’s lower ***,With the increase in irrigation quota,the yield of winter wheat increased,and the water use efficiency(WUE)of winter wheat increased at first and then *** addition,compared with the LD30,MD30,MD60,MD90,MD120,and MD180,the yield of winter wheat in LD60 treatment increased by about 3.23%(3-year average),32.3%,19.9%,11.7%,10.1%,and 14.6%.At the same time,the WUE with LD60 treatment of winter wheat was significantly higher than LD90,LD120,LD180,MD30,MD60,MD90,MD120,MD180 *** was a positive correlation between soil volumetric water content and Pn and between yield and *** key period for yield formation in winter wheat is 180 days after *** conclusion,to achieve the dual goals of stable winter wheat yield and efficient uti
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