Effects of Incorporating Different Proportions of Humic Acid into Phosphate Fertilizers on Phosphorus Migration and Transformation in Soil

文献类型： 外文期刊

第一作者： Jing, Jianyuan

作者： Jing, Jianyuan;Ye, Xinxin;Zhang, Ligan;Xiong, Qizhong;Wang, Yingying;Zhang, Shuiqin;Yuan, Liang;Li, Yanting;Zhang, Yingqiang;Zhao, Bingqiang

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关键词： humic acid-enhanced phosphate fertilizer; incorporating proportion; humic acid; phosphorus migration; phosphorus availability

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

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年卷期： 2023 年 13 卷 6 期

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收录情况： SCI

摘要： Incorporating humic acid (HA) into phosphate fertilizers to produce HA-enhanced phosphate fertilizers (HAPs) can improve the migration and availability of fertilizer-derived phosphorus (P) in soil. However, the optimal proportion of HA remains inconsistent. Here, we investigated the effects of HAPs with different HA proportions (0.1-10% w/w) on water-soluble P fixation rate, P migration, P transformation, and soil microorganisms, and analyzed the main P forms in HAP using Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The results showed that incorporating 0.1% HA had no impact on P migration and transformation, whereas incorporating 0.5-10% HA increased the migration distance and cumulative migration of fertilizer-derived P by 0-5 mm and 17.1-30.3%, respectively, compared with conventional phosphate fertilizer (CP). Meanwhile, HAPs with 0.5-10% HA significantly reduced the water-soluble P fixation rate by 18.3-25.6%, and significantly increased the soil average available P (AP) content in 0-40 mm soil layer around the P application site by 6.2-12.9% relative to CP, partly due to the phosphate monoesters in HAPs. Clustering analysis revealed that 0.5% HA had similar effects relative to higher HA proportions (1% and 5%), and the inhibition of HAP with 0.5% HA on bacteria and fungi was also greater than that of CP due to the high concentration of soil P. Overall, 0.5% was determined to be the optimal amount of HA for HAP production, which provided a theoretical basis for the development of high-efficiency phosphate fertilizer.

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