Title: Evaluating the effects of regulated deficit irrigation on soil water movement, nitrate transport, photosynthetic characteristics, grain yield, water and N use efficiency under furrow irrigation
Authors: Lin Chen; Xiaofei Liu; Liangjun Fei
Addresses: Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, 710048, China; State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China; Department of Environmental Sciences, University of California Riverside, Riverside, CA, 92521, USA ' Key Lab of Crop Water Requirement and Regulation, Ministry of Agriculture and Rural Affairs, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453002, China ' Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an, 710048, China; State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China
Abstract: Methods combining experiment (field) and numerical simulation (HYDRUS-1D) are an efficient approach for revealing the effect of deficit separate furrow irrigation on soil water and nitrogen movement, winter wheat root water and N uptake, physiology and biochemical characteristics. The results showed that the net photosynthetic and transpiration rate of CF were the highest. But the leaf water use efficiency (LWUE) under FI and DSFI were higher than that under CF. The diurnal mean LWUE of DSFI1 in flowering-filling growth stage was the highest among all treatments. The mean proline content of DSFI was higher than that of CF and FI. And the deficit irrigation schedule had non-significant effects on both crop water consumption and water use efficiency but had significant effects on N use efficiency. The deficit irrigation in green-jointing growth stage under furrow irrigation is the best water-saving management strategy for growing winter wheat.
Keywords: winter wheat; soil water dynamics; soil nitrogen transport; regulated deficit furrow irrigation; HYDRUS-1D model; photosynthetic characteristics; plant water and N use efficiency; the leaf water use efficiency; root water and nitrogen uptake; proline content.
International Journal of Environment and Pollution, 2020 Vol.67 No.2/3/4, pp.153 - 181
Received: 23 Mar 2020
Accepted: 21 Nov 2020
Published online: 24 Sep 2021 *