Effect of Irrigation with Slight Saline Water on Photosynthesis Characteristics and Yield of Winter Wheat

PANG Guibin; XU Zhenghe; WANG Haixia; ZHANG Lizhi; WANG Tianyu

doi:10.13522/j.cnki.ggps.2016.0266

Abstract：[Objective]Obtain the suitable alternative of saline water irrigation pattern and reveal the physiologi-cal and growth response mechanism for winter wheat.[Method]A field experiment was conducted in Yellow River Delta,Shandong,North China.Four irrigation treatments(irrigating 80 mm with fresh water each at joint-ing and heading stages,irrigating 80 mm with fresh water each at jointing,heading and milking stages,irrigating 80 mm with fresh-saline water each at jointing and heading stages,irrigating 80 mm with fresh-saline-saline wa-ter each at jointing,heading and milking stages)were designed.The collected datum were used to analyze the ef-fects of saline water irrigation on photosynthesis characteristics,biomass and yield of winter wheat.[Result]The results showed that,compared with the treatment of fully irrigated with fresh water,brackish water irrigation de-creased leaf stomatal conductance and transpiration rate of winter wheat,but no significant change was observed in net photosynthetic rate,thus leaf water use efficiency was increased by 2.8%~43.2%.While brackish water in-hibited plant height and biomass of winter wheat, also yield decreased by 3%~13% and saved fresh water by 50%~67% under the treatment with fresh-saline water.Either fresh water or brackish water,irrigation was benefi-cial to grain filling at milking stages, the 1000-grain was weight increased, and also yield was increased by 11.2%~11.4%.[Conclusion]Therefore,it is prospective to use fresh-saline-saline water irrigation mode of win-ter wheat in the region, which has important practical significance for the sustainable agriculture in the Yellow River Delta.