Water use efficiency and yield responses of cotton to field capacity-based deficit irrigation in an extremely arid area of China  

作　　者：Haifeng Li Zhiming Qi Dongwei Gui Fanjiang Zeng 

机构地区：[1]State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [2]School of Environmental and Land Resource Management,Jiangxi Agricultural University,Nanchang 330045,China [3]Cele National Station of Observation&Research for Desert-Grassland Ecosystem in Xinjiang,Cele 848300,Xinjiang,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《International Journal of Agricultural and Biological Engineering》2019年第6期91-101,共11页国际农业与生物工程学报（英文）

基　　金：The authors wish to acknowledge the funding from Xinjiang Thousand Youth Talents Plan Project(Y672071001);the Doctoral Foundation of Jiangxi Agricultural University(9232304717);the China Scholarship Council program(CSC,201608360137);the National Natural Science Foundation of China(NSFC,U1603343).

摘　　要：The objectives of present investigation were to test the effects on water use efficiency(WUE)and cotton yield of implementing a range of deficit irrigation regimes triggered at specific fractions of root zone soil moisture,field capacity(θfc)and different crop phenological stages.The study was conducted on southern oasis of the Taklamakan desert,China.The cotton crop’s WUE was quantified,as were leaf photosynthesis and yield.From a photosynthetic perspective,deficit irrigation resulted in 16.8%,10.3%and 2.2%increases in leaf WUE underθfc-based regulated deficit irrigation(T1,T2,and T3),compared to the control,respectively.Cotton yield and its components were significantly affected by irrigation depths(p≤0.05).A relatively high seed yield(0.65 kg/m3)and the highest WUE were achieved,under T3(70%θfc at seedling stage,60%θfc at squaring,50%θfc at full-bloom,70%θfc at boll,70%θfc at boll cracking stage),showing it to be the most effective and productive irrigation schedule tested.As the application ofθfc-based deficit irrigation in surface-irrigated cotton fields showed great potential in saving water,maintaining a high WUE,and improving cotton seed yield,a management strategy consisting or irrigation thresholds of 70%θfc in the root zone at the seedling,boll and boll cracking stages,and of 60%θfc at the squaring stage,and 50%θfc at the full-bloom stage,would be recommended for this extremely arid region.

关 键 词：regulated deficit irrigation EVAPOTRANSPIRATION seed cotton yield water use efficiency Qira Oasis 

分 类 号：S51[农业科学—作物学]