Abstract
One of the main problems in the peanut production process is to identify the pod maturity stage. Peanut plants have indeterminate growth, which leads to a high pod maturity variability within the same plant. Moreover, the actual method of determining maturity is destructive and highly subjectivity, which does not represent the overall variability in the field. Hence, the main goal of this study was to verify the possibility to estimate peanut maturity and its in-field variability using an alternative non-destructive method based on orbital remote sensing. High-resolution satellite images (~ 3 m) were obtained from the PlanetScope platform for two commercial peanut fields in São Paulo state, Brazil, during the reproductive stage of the peanut crop (89 to 118 days after sowing—DAS). The fields were divided into 54 plots (30 × 30 m). The maturity was obtained using the Hull Scrape method. All Vegetation Indices (VIs) used showed a high Pearson correlation (p < 0.001) between peanut maturity and the VIs, with values decreasing as maturity increased. Non-Linear Index (NLI) values from 0.561 to 0.465 suggested that pods reached greater maturity than 74% (inflection point). The results found in this study indicated a great potential to use high-resolution satellite images to predict peanut maturity variability in commercial field. In addition, the proposed method contributes to monitoring the dynamics spatio-temporal of maturity progression, allowing for more accurate in-season and inversion management strategies in peanut.
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Acknowledgements
The authors are grateful to the São Paulo State University (UNESP), Jaboticabal Campus for the academic support and availability of laboratories, and the National Council for Scientific and Technological Development (CNPq) for the scholarship to the first author during his Ph.D. The authors are also thankful to Coplana Brazilian Premium Peanuts for providing assistance selecting the fields to conduct the trials and all their support for our team. Finally, we thank the PlanetLab team, in the person of Dr. Joseph Mascaro, who made the educational license available for the accomplishment of this work.
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dos Santos, A.F., Corrêa, L.N., Lacerda, L.N. et al. High-resolution satellite image to predict peanut maturity variability in commercial fields. Precision Agric 22, 1464–1478 (2021). https://doi.org/10.1007/s11119-021-09791-1
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DOI: https://doi.org/10.1007/s11119-021-09791-1