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Nanoparticle and Ionic Zn Promote Nutrient Loading of Sorghum Grain under Low NPK Fertilization
- Dimkpa, Christian O., White, Jason C., Elmer, Wade H., Gardea-Torresdey, Jorge
- Journal of agricultural and food chemistry 2017 v.65 no.39 pp. 8552-8559
- NPK fertilizers, Sorghum (Poaceae), environmental health, exposure pathways, fertilizer application, grain yield, humans, nanoparticles, nitrogen, nutrient use efficiency, nutritive value, phosphorus, pollution load, potassium, soil, zinc, zinc oxide
- This study evaluated the effects of ZnO nanoparticles (NP) or Zn salt amendment on sorghum yield, macronutrient use efficiency, and grain Zn-enrichment. Amendments were through soil and foliar pathways, under “low” and “high” levels of nitrogen, phosphorus, and potassium (NPK). In soil and foliar amendments, grain yield was significantly (p ≤ 0.05) increased by both Zn types, albeit insignificantly with soil-applied Zn at low NPK. Across NPK levels and Zn exposure pathways, both Zn types increased N and K accumulation relative to control plants. Compared to N and K, both Zn types had a mixed effect on P accumulation, depending on NPK level and Zn exposure pathway, and permitted greater soil P retention. Both Zn types significantly (p ≤ 0.05) increased grain Zn content, irrespective of exposure pathway. These findings suggest a nanoenabled strategy for enhancing crop productivity, grain nutritional quality, and N use efficiency based on Zn micronutrient amendments, with potential implications for improved human and environmental health.