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. 2022 May 9;12:7571. doi: 10.1038/s41598-022-11591-0

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(A) The number flight times used in 2020 (left) and in 2021 (right); senescence scored using the orthomosaics of latest four flights in 2021 and two flights in 2020. (B) Variation in senescence and illustration of senescence scores on a scale of 0 to 5 (numbers in black boxes) among different maize row plots (each is plot is two rows, outlined by red or yellow rectangles). Three band channels in orthomosaics were set in QGIS as red–green–blue, red–red–green, and red-green-green from left to right respectively and resulted in three different illustrations in highlighting the row plots with different senescence scores.