This study used ZnO nanoparticles (NPs) as seed treatments and as soil amendments to enhance Zn concentrations in wheat grain. In the seed treatment experiment, seeds were treated with dextran coated (DEX-ZnO) and bare ZnO NP suspensions, in addition to ZnSO4, at 500 mg Zn/L. In the soil amendment experiment, soil pH was adjusted to 6 and 8, then soils were spiked with 15 mg Zn/kg soil in the form of DEX-ZnO and bare ZnO NPs, as well as ZnSO4. For the seed treatment, ZnO NPs resulted in significantly higher grain Zn concentration 96.9 ± 25.4 compared to (72.2 ± 25.4), (78.3 ± 24.3), and (81.0 ± 19.4) mg Zn/kg in the control, ZnSO4, and DEX-ZnO NPs treatments, respectively. In the soil amendment experiment, grain Zn concentrations were the same across all Zn treatments regardless of soil pH. Plants grown at pH 6 had higher Zn accumulation and leaf and stem biomass compared to pH 8. This study demonstrates that treatment of seeds with ZnO NPs can enhance Zn content of grain using far less Zn than is typically used for soil amendments. This may help reduce the environmental impact of Zn fertilization.
|Number of pages||9|
|Journal||Environmental Science and Technology|
|State||Published - Oct 19 2021|
Bibliographical noteFunding Information:
We thank J. Grove, C. Matocha, M. Lovell, C. Chen, J. Li, S. Lichtenberg, S. Shrestha, O. Tsyusko, S. Curieses, J. Dantzer, T. Barton, A. Freytag, J. Connelly, and D. Van Sanford. This is a publication the Kentucky Agricultural Experiment Station. This work is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture under 1010358. Support was also provided by the National Science Foundation under CBET- 1530594.
© 2021 American Chemical Society. All rights reserved.
- Zn malnutrition
- ZnO nanoparticles
- soil pH
ASJC Scopus subject areas
- Chemistry (all)
- Environmental Chemistry