A Nanoplatform for Enhancing Maize Growth through Controlled P Delivery in P-Deficient Soils

作者：Xiaoming Tao, Xintong Lin, Manxi Lin, Jason C. White, Zhenjie Li, Xinyue Wu, Jie Hou, Yangzhi Liu, Zhirui Qin, Jiang Xu, Kun Yang, Daohui Lin · 发表于：Environmental Science & Technology · 年份：2025 · DOI：10.1021/acs.est.5c09016 · 被引用次数：4 · 研究领域：Phosphorus and nutrient management、Plant Micronutrient Interactions and Effects、Layered Double Hydroxides Synthesis and Applications

Nanoenabled phosphorus fertilizers offer controlled release to improve phosphorus utilization efficiency (PUE) and reduce environmental impact, but their performance, particularly in alkaline soils, remains limited. Herein, a P-delivery nanoplatform (PDN) was constructed utilizing a nanoscale magnesium phosphate (nMgP)-supported iron-based layer double hydroxide (green rust, GR) nanocomposite. Its efficacy was evaluated in maize grown in P-deficient soils with pH values of 4.9 and 8.5. Soil-applied PDN (180 mg P/kg soil) significantly enhanced maize photosynthesis by 31.6-32.5% and fresh biomass by 6.9-27.3%, with agronomic efficacy (AE) increasing by 21.1-39.3% over conventional P fertilizers (CPFs). Crucially, lower PDN doses (45-90 mg P/kg soil) could improve maize growth as effectively as CPFs (180 mg P/kg soil), enhancing PUE by 1.6-2.0 times and AE by 159.8-189.5%. Mechanistically, PDN integrated GR-optimized nMgP dissolution, GR-mediated passivation suppression, and GR-P ligand-exchange, synergistically sustaining rhizosphere P bioavailability to minimize leaching and enhance P uptake by maize. Moreover, PDN conversion to bioavailable P species in the rhizosphere could drive the proliferation of beneficial bacteria, creating a growth-enhancing feedback loop. This work presents a new strategy for designing nanomaterials as P-delivery platforms to optimize PUE in crop production, promoting the development of environment-friendly nanoenabled agriculture.