Assessing relationships of cover crop biomass and nitrogen content to multispectral imagery

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Author(s)Miller, Jarrod O.
Author(s)Shober, Amy L.
Author(s)Taraila, Jamie
Date Accessioned2024-04-30T16:28:15Z
Date Available2024-04-30T16:28:15Z
Publication Date2024-02-29
DescriptionThis article was originally published in Agronomy Journal. The version of record is available at: https://doi.org/10.1002/agj2.21554. © 2024 The Authors. Agronomy Journal published by Wiley Periodicals LLC on behalf of American Society of Agronomy. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
AbstractCover crops provide valuable roles in sustainable agriculture, provided they produce enough biomass. To accurately measure their services to field management, spatial estimates would be useful to producers. This study used multispectral drone imagery to produce maps of normalized difference vegetation index (NDVI), normalized difference red edge index (NDRE), and a digital surface model (DSM) of cover crop plots on sandy, Mid-Atlantic soils. Cover crops included cereal rye (Secale cereale), mixtures of rye and crimson clover (Trifolium incarnatum), and mixtures of rye and hairy vetch (Vicia villosa). Their biomass was sampled in the spring of 2019, 2020, and 2021, dried, weighed, and analyzed for total nitrogen (N) content. Measurements of NDVI became saturated (i.e., reached a linear plateau) at 3.86 Mg biomass ha−1, NDRE at 5.72 Mg biomass ha−1, and the DSM at 5.11 Mg biomass ha−1. The measured N content became saturated at 80.9, 139.1, and 75 kg N ha−1 for NDVI, NDRE, and the DSM, respectively. Based on log transformations, NDVI was a stronger predictor of biomass and N, but not C:N. The NDRE was important for biomass, N, and C:N, while the DSM interactions with cover crop species helped predict both the N content and C:N of cover crop tissues. Accumulated growing degree days was important as an individual variable for biomass and N and as an interaction with cover crop species. Abbreviations DSM digital surface model GDD growing degree days NDRE normalized difference red edge index NDVI normalized difference vegetation index
SponsorNatural Resources Conservation Service. Grant Number: #NR1821J2XXXXC003
CitationMiller, J. O., Shober, A. L., & Taraila, J. (2024). Assessing relationships of cover crop biomass and nitrogen content to multispectral imagery. Agronomy Journal, 00, 1–11. https://doi.org/10.1002/agj2.21554
ISSN1435-0645
URLhttps://udspace.udel.edu/handle/19716/34327
Languageen_US
PublisherAgronomy Journal
dc.rightsAttribution-NonCommercial 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
Keywordszero hunger
Keywordsclimate action
Keywordslife on land
TitleAssessing relationships of cover crop biomass and nitrogen content to multispectral imagery
TypeArticle
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