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| DOI：10.13522/j.cnki.ggps.2019097 |
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| Effects of Alternate Irrigation with Fresh and Brackish Water on Winter Wheat Growth and Yield |
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ZHAI Yaming, CHENG Xiuhua, HUANG Mingyi, MIN Yong, QIANG Chao, LYU Wen
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1.College of Agricultural Engineering, Hohai University, Nanjing 210098, China; 2.State Key Laboratory of Hydrology-water Resources And Hydraulic Engineering, Nanjing 210098, China; 3. Jiangsu Taihu Planning Design Institute of Water Resources Co. Ltd, Suzhou 215228, China
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| Abstract: |
| 【Objective】The purpose of this paper is to explore the effect of different alternate irrigation methods of brackish and fresh water on winter wheat growth and yield, and the path analysis was tested to select a suitable alternate irrigation method of brackish and fresh water for high production of winter wheat.【Method】The experiment was conducted in lysimeters under the rain shelter. Brackish water was treated with 3 different salinities (1, 3, 5 g/L NaCl). Fresh water (0.12 g/L NaCl) irrigation throughout the whole growth period was used as the control group. Three alternate irrigation methods of brackish and fresh water, i.e., brackish-fresh-fresh (BFF), fresh-brackish-fresh (FBF) and fresh-fresh-brackish (FFB), were set up at jointing-heading stage, heading-flowering stage and filling stage of winter wheat, respectively. The influence of alternate irrigation on wheat growth, yield and yield components was studied. 【Result】BFF treatment had a greater negative effect on the growth and yield of winter wheat, followed by FBF treatment, and FFB treatment had the least effect. Under the same alternate irrigation method, brackish water with higher salinity caused greater inhibition on winter wheat growth and yield. Path analysis results revealed that the traits that had the greatest direct impact on the yield formation of winter wheat were the number of grains per spike, with a decision coefficient of 0.697 0, followed by straw weight, 1000-grain weight and number of spikes, with decision coefficients of 0.377 5, 0.322 8 and 0.286 6, respectively. Plant height and accumulated dry matter per plant had little impact on the yield of winter wheat.【Conclusion】Irrigation with low salinity brackish water has no obvious effect on grain number per spike, straw weight, 1 000-grain weight and spike number of winter wheat during grain filling stage, thus having little effect on yield. Therefore, fresh water irrigation from jointing to flowering stage and conversion to 3 g/L brackish water irrigation during grain filling stage can ensure higher yield and realize reasonable utilization of brackish water resources. |
| Key words: brackish water; alternate irrigation; winter wheat; path analysis |
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