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. 2019 Mar 1;10:209. doi: 10.3389/fpls.2019.00209

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Copyright © 2019 Polder, Blok, de Villiers, van der Wolf and Kamp.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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RGB image of the experimental field, acquired with UAV on June 19, 2017. The length of the rows is 110 m for rows 1–3 and 66 m for rows 4–7. The location is near Tollebeek in the Netherlands (lower left).