PJB-2025-1551
Effects of potassium-enriched biochar on soybean seedling growth and antioxidant system under salt stress
Shoucheng Huang, Ping Huang, Maohui Gao, Xue Han, Nai Chai, Xinru Zhu, Yonghui Liao and Airong Liu
Abstract
Potassium-enriched biochar (KBC) serves as a novel soil amendment that improves soil fertility and enhances crop stress resistance. This study preliminarily investigated the regulatory effects of different KBC concentrations on soybean (Glycine max) seedling growth and the antioxidant system under salt stress through pot experiments. Under normal cultivation conditions, 1% KBC application significantly promoted seedling growth, increasing plant height and root length by 42.19% and 35.89%, respectively. Metabolic optimization was evidenced by reduced soluble sugar (35.33%) and proline (37.46%) levels at 1% and 2% KBC, respectively, indicating improved carbon-nitrogen metabolism. However, under Salt Stress (200 mmol/L NaCl), total phenolic and flavonoid contents were significantly decreased. The 2% KBC treatment comprehensively enhanced key antioxidant enzyme activities: Superoxide dismutase (SOD) showed the most pronounced increase (27.45%), while catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX) showed coordinated upregulation. This synergistic enhancement effectively mitigated reactive oxygen species (ROS) accumulation. In conclusion, optimal KBC application (1–2%) simultaneously promotes soybean seedling growth, photosynthetic efficiency, and salt-stress tolerance through reinforced antioxidant capacity. These findings provide a theoretical foundation for saline soil remediation and stress-resistant soybean cultivation
To Cite this article:
Huang, S., P. Huang, M. Gao, X. Han, N. Chai, X. Zhu, Y. Liao and A. Liu. 2025. Effects of potassium-enriched biochar on soybean seedling growth and antioxidant system under salt stress. Pak. J. Bot., 57(5): DOI: http://dx.doi.org/10.30848/PJB2025-5(41)
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