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| Effects of ZnO NPs application on winter wheat growth and grain quality in a potentially zinc-deficient area of the Loess Plateau, China |
| Received:November 29, 2018 |
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| KeyWord:ZnO NPs;soil application;foliar application;wheat;grain Zn content |
| Author Name | Affiliation | E-mail | | SUN Hong-da | College of Resources and Environmental Science, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHONG Min-zheng | Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHANG Teng | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHAI Bing-nian | Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | WANG Zhao-hui | Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | MAO Hui | College of Resources and Environmental Science, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | maohui@nwsuaf.edu.cn |
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| Abstract: |
| A two-season field trial was conducted in a potentially zinc-deficient area of the Loess Plateau, which focused on the effect of zinc oxide nanoparticle (ZnO NPs)application on the growth and grain quality of winter wheat. Five treatments, including CK (blank), FZn (foliar application of ZnSO4 solution), SZnO (soil application of ZnO NPs), FZnO (foliar application of ZnO NPs), and SFZnO (soil and foliar combined application of ZnO NPs)were applied. During the two-season field trials, all treatments appeared to show no differences to wheat grain yields or qualities (in terms of starch, soluble sugar, or gluten content). Treatment with ZnO NPs increased grain Zn content significantly, compared with CK, in both growing seasons. Moreover, in comparison with FZn treatment, FZnO and SFZnO treatments increased grain Zn content by 36% and 45% in the first season, and by 12% and 24% in the second season, respectively. Scanning electron microscope analysis of wheat leaves in their elongation stage found particles adhering to the leaf surfaces after FZnO treatment, while no differences were found after FZn and FZnO treatments. Energy Dispersive X-Ray Spectroscopy results showed higher Zn content in selected leaf spots compared with CK and FZn treatments. As a whole, ZnO NPs application showed better grain Zn increasing ability than either CK or ZnSO4 treatments. SFZnO showed the highest grain Zn content (37 mg·kg-1)in the trials, while single foliar applications of ZnO NPs exhibited the highest Zn transfer efficiency. This study has provided evidence that ZnO NPs can be regarded as a new and safe Zn fertilizer, being harmless to winter wheat growth, grain quality and leaf structure. |
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