Volume 187, Issue 5 pp. 653-667
RESEARCH ARTICLE

Synthesis, characterization and evaluation of novel manganese nanoclay polymer composite and nano-MnO2 in wheat

Rakesh Kumar

Rakesh Kumar

Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur, India

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Arun Kumar Jha

Arun Kumar Jha

Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur, India

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Nintu Mandal

Corresponding Author

Nintu Mandal

Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur, India

Correspondence

Nintu Mandal, Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur 813210, India.

Email: [email protected]

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Satdev

Satdev

Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur, India

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Shruti Kumari

Shruti Kumari

Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour, Bhagalpur, India

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First published: 24 January 2024
Citations: 2

This article has been edited by Xian-Zheng Yuan.

Abstract

Background

Manganese (Mn) deficiency due to nutrient mining by high yielding cereal–cereal cropping patterns and forgetfulness of Mn fertilizer applications becomes potential challenge in crop production.

Aim

Nano-enabled Mn fertilizers can be safer and more nutrient efficient than conventional Mn fertilizers (nutrient use efficiency ≈ 1%–3%). However, studies about nano-Mn fertilizer synthesis and their behaviour in soil–plant system are rare.

Methods

In this study, two novel nano-Mn fertilizers, that is nano-MnO2 (NMO) and manganese nanoclay polymer composites (Mn-NCPC), were synthesized, characterized (dynamic light scattering, X-ray diffraction, Scanning electron microscopic and energy-dispersive X-ray, Fourier transform infrared spectroscopy etc.) and investigated for their impact on growth, yield and nutrient acquisition by wheat crop (Triticum aestivum L., variety HD-2967) in a pot culture experiment. Treatment comprised 25%, 50% and 100% of recommended dose of Mn (RDMn) through NMO along with 100% RDMn through MnSO4·H2O (MS). Effect of exposure route was also investigated using foliar spray of NMO at tillering stage. Mn-NCPC was found to be most efficient Mn fertilizer in terms of yield, Mn uptake and use efficiency by wheat crop.

Results

Nano-sized formulations improved the solubility of Mn in soil due to its higher active surface area (NMO) and slow-release behaviour (Mn-NCPC); thus, minimal losses happened due to the fixing of Mn in oxide/hydroxide forms. Application of 25% RDMn through NMO fertilizers maintained equitant diethylenetriamine pentaacetate Mn content to 100% RDMn through MnSO4·H2O. Mn-NCPC stimulated the soil enzymatic activities, namely dehydrogenase, acid–alkaline phosphatase activities. Mn-NCPC and NMO at 100% RDMn recorded 3.51% and 5.20% improvement in grain yield, respectively, when compared to MnSO4·H2O 100%.

Conclusions

Mn fertilizer doses can be reduced up to 25% of RDMn when applied through NMO or Mn-NCPC fertilizers. However, effects of Mn-NCPC and NMO need to be critically evaluated in long-term field experiments in various cropping systems especially under cereal–cereal sequences for economic profitability and wide-scale farmer's adaptability.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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