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| DOI：10.13522/j.cnki.ggps.2025006 |
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| Effects of different fertilizations on soil properties and crop yields on saline-alkali soils in the Western Liaohe Plain |
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XING An, XING Haifeng, ZHAO Bayinnamula, JING Yupeng, HU Buqin
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1. College of Resources and Environmental Sciences, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China;
3. Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China; 4. Inner Mongolia Academy of Agricultural Sciences, Hohhot 010031, China;
5. Hulunbuir University, Hailar 021008, China
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| Abstract: |
| 【Objective】Saline-alkali soils pose significant challenges to agriculture in the Western Liaohe Plain of Inner Mongolia. This paper experimentally evaluates the effects of different fertilizations on soil quality and crop yield in theses saline-alkali soils.【Method】A field experiment was conducted in a sunflower field on a saline-alkali soil, and it consisted of five fertilization treatments: no fertilization (CK), conventional fertilization (CF), reducing nitrogen fertilizer by 30% (OF1), reducing nitrogen fertilizer by 30% coupled with replacing 50% of chemical fertilizer with organic fertilizer (OF2), combined OF2 with addition of desulfurized gypsum (OF3). During the experiment, we measured crop yield, soil nutrients, and salinity-alkalinity in the 0-60 cm of soil profile.【Result】Treatment OF3 significantly reduced soil pH and alkalinity in the 0-20 cm topsoil layer, decreasing pH by 0.64 and 0.63 units compared to CK and CF, respectively, and reducing alkalinity by 31.26% and 32.36%. Treatment OF2 decreased salt content in the topsoil by 6.98% and 9.09% relative to CK and CF. The average desalination rate in the topsoil exceeded 17%. Compared to CK, OF2 increased soil organic matter, total nitrogen, available phosphorus, and available potassium by 13.71%, 18.55%, 23.67%, and 19.76%, respectively; OF3 further increased these parameters by 14.68%, 16.49%, 34.61%, and 37.65%. Grain yield was improved by 68.21% and 84.85% in OF2 and OF3 treatments, respectively, relative to CK. Principal component analysis ranked the treatment effects on soil properties, nutrients, and crop yield as OF3＞OF2＞CF＞OF1＞CK.【Conclusion】Reducing nitrogen fertilization and substituting part of chemical fertilizers with organic fertilizers, combined with desulfurized gypsum addition, effectively improved soil fertility, mitigated salinization and alkalization, and enhanced crop yields in the saline-alkali soils on the Western Liaohe Plain. |
| Key words: optimized fertilization; reducing quantity and increasing efficiency; organic fertilizer; saline-alkali soil; nutrient status; saline-alkali characteristics |
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