Magnesium fertilizer combined with biochar improves soil magnesium availability by affecting soil magnesium form transformation and migration

作者：Zhen Li, Jing Li, Yongzhou Hao, Yutao Peng, Yixuan Lian, Qingran Guo, Jingjing Chang, Liangquan Wu, Lei Chen, Yanshu Hao, Baige Zhang · 发表于：Industrial Crops and Products · 年份：2025 · DOI：10.1016/j.indcrop.2025.122171 · 被引用次数：3 · 研究领域：Magnesium in Health and Disease、Magnesium Alloys: Properties and Applications、Magnesium Oxide Properties and Applications

Achieving long-lasting management of magnesium (Mg) on acidic soils is an important guarantee for the sustainable development of intensive agriculture to increase production and quality. In this study, we examined the synergistic effects of Mg fertilizer and biochar on Mg availability in two consecutive years of experiments, in which Mg fertilizer and biochar were added individually or in combination to wax gourd grown under Mg limitation on acidic soils in South China. The data revealed that the addition of Mg fertilizer gradually removed the dominant limiting factor by increasing the content of different forms of Mg (e.g., the exchangeable Mg content increased by an average of 32.1 %) and improved wax gourd yield. However, Mg application alone reduces the adsorption capacity of soil for Mg 2 + (adsorption capacity decreased by an average of 9.6 %) and increases the leaching risk, resulting in low availability of soil Mg. Strikingly, the addition of biochar synergistically improved the overall uptake of Mg, mainly by driving Mg form transformation through improved soil physicochemical properties while increasing soil adsorption capacity for Mg 2+ (adsorption capacity increased by an average of 15.1 %). Despite the significant enhancement in wax gourd yields following biochar application alone, there are still Mg limitations. On the contrary, the synergistic application of Mg fertilizer and biochar improved the physical and chemical properties of the soil and greatly increase...