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| Effects of hydroxyapatite-bentonite nanocomposites on maize growth in arid regions |
| Received:December 20, 2024 |
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| KeyWord:hydroxyapatite;bentonite;phosphate fertilizer;arid region;phosphorus absorption |
| Author Name | Affiliation | E-mail | | LI Luhan | School of Life Sciences, Northwest A&F University, Yangling 712100, China
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, China | | | SUN Yangping | School of Life Sciences, Northwest A&F University, Yangling 712100, China
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, China | | | MA Ruixue | School of Life Sciences, Northwest A&F University, Yangling 712100, China
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, China | | | ZHAO Ying | Institute of Agricultural Resources and Environment, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan 750002, China | | | ZHAO Xiaochen | Tianjin Kunhe Bio-technology Group Co., Ltd., Tianjin 300450, China | | | WEI Gehong | School of Life Sciences, Northwest A&F University, Yangling 712100, China
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, China | weigehong@nwsuaf.edu.cn | | CHEN Chun | School of Life Sciences, Northwest A&F University, Yangling 712100, China
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, China | chunchen@nwsuaf.edu.cn |
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| Abstract: |
| To optimize the phosphorus release capacity of hydroxyapatite（HAP）. Enhance maize growth by increase soil available phosphorus content, improve the phosphorus absorption and drought resistance, this study modified HAP with bentonite（BE）to produce nano-fertilizer compound（BE-HAP）. Using a combination of pot experiments and soil microcosm techniques, we explored the mechanisms by which BE-HAP composites influence plant phosphorus uptake, improve maize growth under drought conditions, promote soil nutrient transformation, and regulation soil microbial community structure. The results showed that the 1∶1 BE-HAP composite significantly increased the available phosphorus content in sandy soil by 64.8%, 42.3%, 21.3%, and 84.2% at 0, 28, 42 and 56 days respectively. Furthermore, BE-HAP treatment significantly enhanced phosphorus content in maize plants by 35.1% and 35.7%, boosting growth and photosynthesis under drought stress, and improving maize dry weight of above and below ground by 93.7% and 186.0%. This treatment also reduced malondialdehyde levels by 45.0%, increased the activity of antioxidant enzymes, and strengthened maize ′ s resistance to oxidative stress. In addition, the relative abundances of Chitinophaga were significantly reduced by increasing soil phosphorus nutrients with different proportions of BE-HAP treatment. Functional prediction using FAPROTAX revealed that the 5∶1 and 10∶1 BE-HAP composites stimulated several microbially mediated carbon and nitrogen cycling processes, such as nitrogen fixation and nitrate denitrification, thereby accelerating microbial nutrient cycling. In summary, hydroxyapatite-bentonite nanocomposites can significantly enhance the growth performance of maize under drought stress. This is achieved through multiple mechanisms, including increasing the available phosphorus content in the soil, mitigating oxidative damage in plants, accumulating drought-resistant substances, and promoting nutrient conversion driven by microbial activity. |
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