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Article

Foliar Application of Zn Agrichemicals Affects the Bioavailability of Arsenic, Cadmium and Micronutrients to Rice (Oryza sativa L.) in Flooded Paddy Soil

Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, USA
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Author to whom correspondence should be addressed.
Academic Editor: Vasileios Antoniadis
Agriculture 2021, 11(6), 505; https://doi.org/10.3390/agriculture11060505
Received: 6 May 2021 / Revised: 26 May 2021 / Accepted: 28 May 2021 / Published: 30 May 2021
(This article belongs to the Special Issue The Role of Metallic Nanoparticles in Crop Growth and Development)
Zinc (Zn) is a key micronutrient affecting bio-functions of crops. Impacts of foliar application of three forms of Zn-containing agrichemicals on the physiology of rice seedlings and their uptake of heavy metal(loid)s and micronutrients from fully flooded paddy soils were investigated in a greenhouse study. Rice seedlings 45 days after germination were randomly exposed to an equivalent amount of 100 mg L−1 of zinc oxide nanoparticles (ZnONPs), zinc oxide bulk particles (ZnOBPs), and zinc salts (Zn2+) through foliar exposure. At termination, rice seedlings were divided into roots and shoots and the concerned metal contents in plant tissues were determined with an inductively coupled plasma mass spectrometry (ICP-MS). Our results demonstrated that all Zn agrichemicals displayed a similar effect on plant growth, but ZnONPs led to the greatest root exudate excretion and greatest inhibition in arsenic (As) uptake. Foliar application of ZnONPs resulted in 28% less As in rice shoots while Zn2+ only caused a 15% decrease in As accumulation in the same tissues. ZnOBPs had minimal impact on As concentration in rice shoots. ZnONPs also promoted iron (Fe) and copper (Cu) uptake in rice shoots, both of which are essential micronutrients for humans. The results suggest that foliar application of ZnONPs resulted in more favorable outcomes for plant growth and food safety than other two types of Zn. Overall, our results showed that application of nanoagrichemicals have important food safety and nutrition implications in addition to their agronomical roles and ZnONPs could be potentially used to alleviate As uptake and fortify Zn and other essential micronutrients in rice grains. View Full-Text
Keywords: Zinc oxide nanoparticles; rice; foliar application; arsenic; cadmium; micronutrients Zinc oxide nanoparticles; rice; foliar application; arsenic; cadmium; micronutrients
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MDPI and ACS Style

Sharifan, H.; Ma, X. Foliar Application of Zn Agrichemicals Affects the Bioavailability of Arsenic, Cadmium and Micronutrients to Rice (Oryza sativa L.) in Flooded Paddy Soil. Agriculture 2021, 11, 505. https://doi.org/10.3390/agriculture11060505

AMA Style

Sharifan H, Ma X. Foliar Application of Zn Agrichemicals Affects the Bioavailability of Arsenic, Cadmium and Micronutrients to Rice (Oryza sativa L.) in Flooded Paddy Soil. Agriculture. 2021; 11(6):505. https://doi.org/10.3390/agriculture11060505

Chicago/Turabian Style

Sharifan, Hamidreza, and Xingmao Ma. 2021. "Foliar Application of Zn Agrichemicals Affects the Bioavailability of Arsenic, Cadmium and Micronutrients to Rice (Oryza sativa L.) in Flooded Paddy Soil" Agriculture 11, no. 6: 505. https://doi.org/10.3390/agriculture11060505

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