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Glutamic Acid-Enhanced Phosphate Fertilizer Increases Phosphorus Availability in Fluvo-Aquic Soil via Phosphamide (O = P-N) Formation, Decreasing Phosphate Fixation and Increasing Soil Microbial Diversity

文献类型： 外文期刊

作者： Zhang, Yingqiang 1 ; Zhang, Shuiqin 1 ; Zhao, Bingqiang 1 ; Li, Yanting 1 ; Xu, Meng 1 ; Yan, Yan'ge 1 ; Jing, Jianyuan 2 ; Yuan, Liang 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

2.Anhui Agr Univ, Sch Resources & Environm, Anhui Prov Key Lab Farmland Ecol Conservat & Pollu, Hefei 230036, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China

关键词： Glutamic acid-enhanced phosphate fertilizer; Structural characteristics; Soil available phosphorus; Inorganic phosphorus fractions; Microbial diversity

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.9； 五年影响因子：3.9 ）

ISSN： 0718-9508

年卷期： 2024 年

页码：

收录情况： SCI

摘要： At low concentrations, incorporating amino acids into phosphate fertilizer reportedly improves phosphate fertilizer efficiency, but a limited understanding of the mechanisms leading to higher efficiency has hindered practical application of amino acids in high-efficiency phosphate fertilizer production. We prepared phosphate fertilizer containing glutamic acid (GA) at 0.2% w/w (GAP0.2) through a simulated industrial process. Structural characterization of GAP0.2 and conventional phosphate fertilizer (CP) analyzed via Fourier transform infrared spectroscopy (FTIR), 31P-nuclear magnetic resonance (31P NMR), and X-ray photoelectron spectroscopy (XPS). Soil incubation experiments were conducted to explore the effects of GAP application on fertilizer-derived P transformation and soil microbial community structure. Multispectral structural analysis suggested that GA amino group reacted with hydroxyl groups in the phosphate fertilizer, leading to accumulation of unidentified compounds with characteristic phosphamide (O = P-N) groups absent in CP. Inorganic phosphorus (P) fractionation in calcareous fluvo-aquic soil treated with GAP0.2 showed that available P content was 17% higher than in CP. Path analysis indicated that increased available P was directly related to 23% higher Ca2-P pools and indirectly related to 8.0% lower Ca8-P contents in GAP0.2-treated soil compared to CP at Days 1, suggesting that GA incorporation could inhibit P fixation at the early stage. Assessment of microbial turnover by alkaline phosphatase (ALP) assays indicated that activity was 21% higher in GAP0.2-treated soil, while phoD gene diversity was 23% higher at Days 28, suggesting enrichment for P biotransformation capacity in soil microbiota. GAP0.2 can improve phosphate fertilizer efficiency via decreasing the precipitation formation or/and increasing P-related microbial diversity in fluvo-aquic soil.

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