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| DOI：10.13522/j.cnki.ggps.2026055 |
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| Effects of organic fertilization on soil quality in cotton fields under supplementary brackish water irrigation |
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Wang Qi, Shan Yu, Ji Chen, Liu Fujing, Cheng Lihao, Xu Kaijiang,
Zhou Chenglong, Liu Yunhua, Sheng Jiandong
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1. College of Resources and Environment, Xinjiang Agricultural University/Xinjiang Plantation Green Production Engineering Technology Center, Urumqi 830052, China; 2. Shaya Lihua Modern Agriculture Co., Ltd., Akesu 842200, China
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| Abstract: |
| 【Objective】In arid regions, brackish water is often used as a supplementary irrigation resource in agricultural production, but its long-term application could lead to soil salinization and soil health degradation. This study experimentally evaluated the feasibility of using organic fertilization to mitigate these adverse effects.【Method】The experiment was conducted in a cotton field in Shaya County, Xinjiang. It consisted of five treatments: freshwater irrigation throughout the growing season (CK), supplementary irrigation with brackish water with a salinity of 5 g/L at the budding and flowering-boll stages (S5), and S5 combined with cattle manure application (S5+C15), soluble organic fertilization (S5+D60), and both cattle manure and soluble organic fertilization (S5+C15+D60). After harvest, soil samples were collected from the 0-20 cm soil layer to determine the changes in soil salinity, soil organic carbon, alkali-hydrolysable nitrogen, available phosphorus, and available potassium. Soil aggregation was also assessed using the dry-sieving method to measure to measure mean weight diameter (MWD), mean geometric diameter (GMD), and nutrient contents in different aggregate classes.【Result】Supplementary irrigation with brackish water increased the topsoil salinity by 31.14% and reduced aggregate stability, with MWD and GMD decreasing by 20.20% and 36.96%, respectively, compared with CK. Organic fertilization alleviated these adverse effects. The S5+C15 and S5+C15+D60 treatments not only reduced soil salinity to levels significantly lower than those under S5 but also reduced it below the CK level, while significantly increasing soil organic carbon, available nutrient contents, and soil aggregate stability. The combined application of cattle manure and soluble organic fertilizer (S5+C15+D60) produced the most pronounced effects. Compared with S5, it reduced soil salinity by 40.25% and increased soil organic carbon, available phosphorus, available potassium, and alkali-hydrolysable nitrogen by 29.61%, 21.19%, 53.65%, and 47.86%, respectively, while increasing MWD and GMD by 58.66% and 148.08%, respectively. We also found that organic carbon and alkali-hydrolysable nitrogen were predominantly associated with aggregates ＞2 mm, while available phosphorus was mainly associated with aggregates of 0.25-2 mm. In contrast, available potassium did not show significant dependence on aggregate size.【Conclusion】Organic fertilization, particularly combined application of cattle manure and soluble organic fertilizer, can effectively alleviate soil salinity, enhance aggregate stability, and improve soil fertility under brackish water supplementary irrigation. It can thus be used as an improved agronomic practice for sustainable utilization of brackish water resource for agricultural production in arid regions. |
| Key words: brackish water supplementary irrigation organic fertilizer soil aggregates soil nutrients cotton field |
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