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| DOI：10.13522/j.cnki.ggps.2025109 |
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| The combined effects of aerated irrigation and biochar application on water-salt dynamics and yield of winter wheat in coastal saline soil |
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ZHU Yuduo, PANG Guibin, CAI Chenyang, CONG Xin,
HUANG Qian, WANG Wei, WANG Xin, XU Zhenghe
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1. School of Water Conservancy and Environment, Jinan University, Ji’nan 250022, China;
2. Wanjiang Institute of Technology, Ma’anshan 243031, China;
3. Shandong Provincial Academy of Water Sciences, Ji’nan 250013, China
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| Abstract: |
| 【Background and Objective】Coastal saline soils are important land resources in many countries but are threatened by rapid salinization, which degrades soil quality, restricts crop growth and reduces agricultural productivity. To address these challenges, this paper evaluates the combined effects of aerated irrigation and biochar amendment on water-salt dynamics and the growth and yield of winter wheat in saline soils.【Method】The experiments were conducted outdoors using soil-filled pots. We compared four treatments: Keeping dissolved O2 concentration in the irrigation water at 9.5 mg/L (background value) without biochar application (CK), increasing dissolved O2 concentration in the irrigation water to 15.5 mg/L without biochar application (FO); keeping dissolved O2 concentration in the irrigation water at 9.5 mg/L with 10 g/kg of biochar application (FC), increasing dissolved O2 concentration in the irrigation water to 15.5 mg/L with 10 g/kg of biochar application. During the experiment, we measured water-salt transport dynamics, as well as wheat growth traits.【Result】FOC significantly increased soil water content in the 0-20 cm layer and facilitated water and salt transport. By harvest, soil salinity under FOC decreased to 0.58-1.02 g/kg, transforming mildly salinized soil into non-salinized soil. Winter wheat under FOC achieved the highest plant height, stem diameter, relative chlorophyll content, leaf area, root biomass, and straw biomass, fully supporting crop development. Yield components, including 100-grain weight and spike grain numbers, were maximized in FOC, resulting in a yield of 120.79 g/pot, 8.36%, 14.09%, and 21.09% higher than FC, FO, and CK, respectively. The impact of treatments on growth and yield was ranked as follows: FOC＞FC＞FO＞CK.【Conclusion】Aerated irrigation and biochar act synergistically to reduce soil salinity stress, thereby promoting wheat growth and grain filling, ultimately improving its productivity. This combination provides an effective strategy for sustainable cultivation in coastal saline soils. |
| Key words: aeration irrigation; biochar; saline soil; water and salt movement; winter wheat growth |
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