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.
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).
作者简介
Haifeng Li,Assistant Professor,research interests:plant physiology and soil ecology,soil and water conservation,Email:haifengl1984@jxau.edu.cn;Zhiming Qi,Professor,research interests:irrigation and drainage engineering,Email:qzhiming@ms.xjb.ac.cn;Dongwei Gui,Professor,research interests:oasis ecology,Email:guidwei@ms.xjb.ac.cn;Corresponding author:Fanjiang Zeng,Professor,research interests:plant physiology and ecology in arid area,soil and water conservation.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China.Tel:+86-991-7885442,Email:zengfj@ms.xjb.ac.cn.
