Co-applied nitrogen and auxin via nano-clay-polymer composites enhances yield and nitrogen use efficiency

Chatterjee, Dibyendu; Adak, Totan; Nayak, Bitish Kumar; Paul, Ranjan; Pradhan, Abhijit; Sutton, Mark A. ORCID: https://orcid.org/0000-0002-1342-2072; Drewer, Julia ORCID: https://orcid.org/0000-0002-6263-6341; Das, Saikat Ranjan; Nayak, Amaresh Kumar; Pathak, Himanshu. 2023 Co-applied nitrogen and auxin via nano-clay-polymer composites enhances yield and nitrogen use efficiency. Journal of Soil Science and Plant Nutrition, 23 (4). 6445-6458. 10.1007/s42729-023-01499-7

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Abstract/Summary

Simultaneous application of nitrate (NO3−-N) and synthetic auxin in nano-clay-polymer composites (NCPC) is hypothesized to increase rice yield and nitrogen (N) use efficiency. A pot experiment was conducted in 2019 at ICAR-National Rice Research Institute (NRRI), Cuttack, Odisha, India, during Rabi season with rice variety Sahbhagi dhan with eight treatments, viz. control, auxin 1-naphthaleneacetic acid (NAA), sodium nitrate (NaNO3), NAA + NaNO3, NCPC, NCPC + NAA, NCPC + NaNO3 and NCPC + NAA + NaNO3, in four replicates using a basal addition of 1/3 of the recommended dose, i.e. 35.71 mg N kg−1. Except for the control, urea was applied to all the treatments at maximum tillering and panicle initiation stages using one-third of the recommended N dose at each stage without further addition of NAA or NCPC. Phosphorus and potassium were added at the rate of 17.86 mg kg−1 in all pots (including control). Plant yield increased more in NCPC-loaded NaNO3 fertilizer treatments than the NaNO3 fertilizers alone. Combined application of NaNO3 and NAA loaded in NCPC resulted in the highest yield, which was 71%, 43% and 28% higher than the control, sole application of NAA and sole application of NaNO3, respectively. Combined application of NCPC, NaNO3 and NAA was found to have 7.6% higher total N content in grain than the NaNO3 alone. Although the pH and electrical conductivity remained unchanged among all treatments, it was found that soil available N (175 mg kg−1) and N uptake in straw and grain were highest in the NCPC + NAA + NaNO3 treatment. Hence, we conclude that smart delivery of NO3−-N and synthetic auxin through NCPC offers significant benefits in terms of yield, N content and N use efficiencies in rice.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s42729-023-01499-7
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	0718-9508
Additional Information. Not used in RCUK Gateway to Research.:	Publisher link (see Related URLs) provides a read-only full-text copy of the published paper.
Additional Keywords:	kaolinite, polyacrylate, 1-naphthaleneacetic acid, nitrogen use efficiency, sodium nitrate
NORA Subject Terms:	Agriculture and Soil Science Atmospheric Sciences
Related URLs:	Publisher
Date made live:	10 Nov 2023 08:50 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/536130

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