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Agronomy 2018, 8(9), 158; https://doi.org/10.3390/agronomy8090158

Effects of Manganese Nanoparticle Exposure on Nutrient Acquisition in Wheat (Triticum aestivum L.)

1
International Fertilizer Development Center (IFDC), Muscle Shoals, AL 35662, USA
2
The Center for Nanotechnology and Agricultural Pathogen Suppression (CeNAPS), New Haven, CT 06511, USA
3
Environmental Science and Engineering, University of Texas, El Paso, TX 79968, USA
4
The Connecticut Agricultural Experiment Station, New Haven, CT 06511, USA
5
Chemistry Department, University of Texas, El Paso, TX 79968, USA
*
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 10 August 2018 / Accepted: 17 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue Nanotechnology Applications in Agriculture System)
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Abstract

Nanoparticles are used in a variety of products, including fertilizer-nutrients and agro-pesticides. However, due to heightened reactivity of nano-scale materials, the effects of nanoparticle nutrients on crops can be more dramatic when compared to non nano-scale nutrients. This study evaluated the effect of nano manganese-(Mn) on wheat yield and nutrient acquisition, relative to bulk and ionic-Mn. Wheat was exposed to the Mn types in soil (6 mg/kg/plant), and nano-Mn was repeated in foliar application. Plant growth, grain yield, nutrient acquisition, and residual soil nutrients were assessed. When compared to the control, all Mn types significantly (p < 0.05) reduced shoot N by 9–18%. However, nano-Mn in soil exhibited other subtle effects on nutrient acquisition that were different from ionic or bulk-Mn, including reductions in shoot Mn (25%), P (33%), and K (7%) contents, and increase (30%) in soil residual nitrate-N. Despite lowering shoot Mn, nano-Mn resulted in a higher grain Mn translocation efficiency (22%), as compared to salt-Mn (20%), bulk-Mn (21%), and control (16%). When compared to soil, foliar exposure to nano-Mn exhibited significant differences: greater shoot (37%) and grain (12%) Mn contents; less (40%) soil nitrate-N; and, more soil (17%) and shoot (43%) P. These findings indicate that exposure to nano-scale Mn in soil could affect plants in subtle ways, differing from bulk or ionic-Mn, suggesting caution in its use in agriculture. Applying nano Mn as a foliar treatment could enable greater control on plant responses. View Full-Text
Keywords: Bioaccumulation; macronutrients; manganese oxide nanoparticles; near-neutral soil; translocation factor; wheat Bioaccumulation; macronutrients; manganese oxide nanoparticles; near-neutral soil; translocation factor; wheat
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Dimkpa, C.O.; Singh, U.; Adisa, I.O.; Bindraban, P.S.; Elmer, W.H.; Gardea-Torresdey, J.L.; White, J.C. Effects of Manganese Nanoparticle Exposure on Nutrient Acquisition in Wheat (Triticum aestivum L.). Agronomy 2018, 8, 158.

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