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Spectral behavior of Macaúba palms (Acrocomia aculeata) under different lighting conditions and phenological stages

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dc.contributor.authorSantana, L.S.
dc.contributor.authorSurmani, C.L.S.
dc.contributor.authorSantos, L.G. Maciel dos
dc.contributor.authorLopes, M.D.S.
dc.contributor.authorda Silva, J.M.
dc.contributor.authorEvaristo, A.B.
dc.contributor.authorRossi, G.
dc.contributor.authorBambi, G.
dc.date.accessioned2026-08-26T07:54:51Z
dc.date.available2026-08-26T07:54:51Z
dc.date.issued2026
dc.descriptionReceived: January 19th, 2026 ; Accepted: March 16th, 2026 ; Published: August 21st, 2026 ; Correspondence: santana.santos@ufvjm.edu.breng
dc.description.abstractClimate change events highlighted concerns about renewable energy consumption. The Macaúba palm (Acrocomia aculeata) stands out as a palm with high potential for energy production. However, it is still in the domestication phase as an agricultural crop. Thus, integrating technologies such as remote sensing to monitor plant characteristics can contribute to understanding this crop's development. In this context, the study aimed to evaluate the spectral behavior of Macaúba (Acrocomia aculeata) under various lighting conditions and at different phenological stages. Multispectral images were obtained using a Multispectral Remotely Piloted Aircraft (RPA), with flights conducted at 8:00 AM, 12:00 PM, and 4:00 PM, and during two seasonal periods (February and June 2025). The aim was to analyze the effects of solar variation and plant development on reflectance and spectral indices. The results showed a strong influence of illumination on the spectral response, with an 80% reduction in reflectance under shade, with the red band being the most sensitive. Multitemporal analysis revealed marked decreases in the TCARI (-83.7%), OSAVI2 (-80.8%), and TCARI/OSAVI (-15.9%) indices, accompanied by a decrease in photosynthetic pigments and the onset of leaf senescence during the dry season. Conversely, the NDRE (+10.1%) and CIgreen (+24.7%) indices increased, reflecting maintenance of photosynthetic activity and the emergence of new leaves. NDVI remained stable, indicating the conservation of canopy structure. Multispectral RPAs' potential for phenological and physiological monitoring of tropical palms, emphasizing the importance of temporal and geometric standardization of acquisitions to ensure radiometric consistency. Integrating spectral data with solar parameters is an effective strategy to enhance the sustainable management of Macaúba palms.eng
dc.identifier.citationSantana, L. S., Surmani, C. L. S., dos Santos, L. G. M., Lopes, M. D. S., da Silva, J. M., Evaristo, A. B., Rossi, G., & Bambi, G. (2026). Spectral behavior of Macaúba palms (Acrocomia aculeata) under different lighting conditions and phenological stages. Estonian University of Life Sciences. https://doi.org/10.15159/AR.26.061en
dc.identifier.issn2228-4907
dc.identifier.publicationAgronomy Research, 2026, vol. 24, Special Issue 2, pp. x–ceng
dc.identifier.urihttp://hdl.handle.net/10492/10992
dc.identifier.urihttps://doi.org/10.15159/ar.26.061
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectremote sensingeng
dc.subjectprecision agricultureeng
dc.subjectrenewable energyeng
dc.subjectphotogrammetryeng
dc.subjectarticleseng
dc.titleSpectral behavior of Macaúba palms (Acrocomia aculeata) under different lighting conditions and phenological stageseng
dc.typeArticleeng

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