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Evaluation of Efficacy of ZnO Nanoparticles as Remedial Zinc Nanofertilizer for Rice

  • Reetu Bala
  • Anu KaliaEmail author
  • Salwinder Singh Dhaliwal
Research Article
  • 11 Downloads

Abstract

Zinc (Zn) is an important element of nutritional significance to humans, animals, and plants. The impact of zinc oxide nanoparticles (ZnONPs) foliar spray at four different concentrations, viz. 0, 0.5, 1.0 and 5.0 g L−1 at 15-day interval on rice crop cv. PR-121 grown in Zn-deficient soil was assessed in a pot study for remediation of Zn deficiency and enhanced Zn fortification. The soil samples were analyzed for chemical properties, culturable microbial counts, dehydrogenase activity and plant vegetative characteristics, yield, and nutrient profile while the leaf samples were analyzed by scanning EM imaging and SEM-EDS techniques. The leaf surface after foliar spray showed the presence of ZnONPs on the leaf lamina near stomatal openings. The foliar application of ZnONPs (@ 5.0 g L−1) significantly improved the growth and yield parameters. However, root characteristics attained the highest values at 1.0 g L−1 ZnONPs application. The soil microbial counts and enzyme activities such as viable cell counts and dehydrogenase activity were observed to be the highest at 5.0 g L−1 ZnONPs treatment. Overall, ZnONPs treatments successfully reverted the Zn-deficiency symptoms besides enhancing the plant Zn contents, though the response was concentration dependent. These findings indicate that ZnONPs can be effectively used for remediation and Zn fortification in rice cultivated under low soil Zn concentrations.

Keywords

Electron microscopy Foliar application Soil enzyme activity Soil microbes Zinc remediation ZnO NPs 

Notes

Funding

This study was funded by the Indian Council of Agricultural Research, New Delhi, under Nanotechnology Platform.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Sociedad Chilena de la Ciencia del Suelo 2019

Authors and Affiliations

  • Reetu Bala
    • 1
  • Anu Kalia
    • 2
    Email author
  • Salwinder Singh Dhaliwal
    • 3
  1. 1.Department of Microbiology, College of Basic Science and HumanitiesPunjab Agricultural UniversityLudhianaIndia
  2. 2.Department of Soil Science, Electron Microscopy and Nanoscience LaboratoryPunjab Agricultural UniversityLudhianaIndia
  3. 3.Department of Soil Science, Micronutrient Laboratory, College of AgriculturePunjab Agricultural UniversityLudhianaIndia

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