| Effects of forage planting on improvement of soda saline\|alkaline soil under shallow buried drip irrigation conditions |
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| DOI：10.7606/j.issn.1000-7601.2026.03.22 |
| Key Words: soda saline\|alkali soil forage grass soil alkalinity soil pH shallow buried drip irrigation |
| Author Name | Affiliation | | GU Qiuying | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | YANG Shuqing | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | ZHANG Wanfeng | Tourism College of Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China | | E Jifang | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
Inner Mongolia Hengyuan Water Conservancy Engineering Co., Ltd., Hohhot, Inner Mongolia 010010, China |
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| Abstract: |
| To investigate the ameliorative effects of planting salt\|tolerant forage grasses on soda saline\|alkaline soil under water\|saving irrigation and to identify the most effective forage species, field trials were conducted from April 2023 to October 2024 on the West Liaohe Plain, where three types of pasture grasses were planted: Sorghum bicolor×sudanense (DS), Sorghum bicolor (DB), ‘Zhaomu No.1’ barnyard (DC), and an open field (CK). The trials used shallow buried drip irrigation to analyze changes in soil nutrients and salinity features. The TOPSIS method was applied to evaluate the comprehensive effects. The results showed that compared with CK, planting forage grass can increase soil organic matter content by 55% to 141%, and the improvement effect increases with the length of planting time. Among them, the DS treatment had the highest organic matter content, reaching 25.993 g·kg-1, an increase of 141% compared with CK. After two years of planting, the soil available potassium content significantly increased, reaching a peak during the vigorous growth period. The DC treatment had the highest available potassium content in the early stage, with an increase of 255% compared to the CK, while the DS treatment showed the best results in the later stage, with an average available potassium content of 874.82 mg·kg-1 at harvest, representing a 494% increase. The alkalinity and pH of the soil decreased significantly over time in all treatments, with the DS treatment showing the most prominent effect. The average alkalinity after two years was 13.7%, a decrease of 63.9% compared to the CK, and the average pH was 7.34, a decrease of 10.4%. Total salt content decreased in a fluctuating manner over time, with the DC treatment showing the best effect, with an average decrease of 42.6% over two years. Additionally, the improvement effect weakened with increasing soil depth, with the 0-20 cm soil layer showing better improvement effects than the 20-60 cm layer. Based on the comprehensive evaluation results using the combined weighted TOPSIS method, the DS treatment had the highest fit (0.726). In summary, planting Sorghum bicolor×sudanense under shallow drip irrigation in the West Liaohe Plain effectively improves soda saline\|alkaline soil. |
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