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. 2019 Nov 1;15:123. doi: 10.1186/s13007-019-0508-7

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Field location and layout. The field was located in eastern Nebraska, USA (left). Cyan line indicates the flight path, and yellow rectangles indicate the studied 170 plots (right). The map was generated using images collected on April 27, 2018