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Thesis (PhD(Environment Science and Engineering))--University of South Australia, 2019. Includes bibliographical references (pages 117-118) Zinc (Zn) is an essential micronutrient, and humans need it in small amounts to ensure development and growth and to protect against infectious diseases. However, its deficiency is one of the most widespread nutrient deficiencies in the world, affecting up to one third of the world’s human population and 50% of the world’s arable soils. Using Zn fertilisers has proven difficult due to unfavourable soil conditions in some parts of the world, including Australia. This project investigated the absorption and translocation of foliar-applied Zn oxide nanoparticles (ZnO-NPs) in wheat. Zinc absorption through the leaf surface was much lower for ZnO-NPs than soluble Zn sources, but the relative translocation was higher. Coating the NPs did not appear to affect absorption, but may affect long-term adhesion to the leaf surface, which can facilitate sustained absorption and movement to the grains. |
