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. 2020 Jul 2;10:10851. doi: 10.1038/s41598-020-67467-8

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Mode of construction of RFs in Mossaka. (A) Materials used to construct RFs, and sequence of placement. Lipu: earth clumps with rooted vegetation; puleke: topsoil with vegetation debris; tse: topsoil from the RFSA; bongo: grey clay (C horizon) (Ilustration made with Adobe Illustrator). (B) Area cleared of vegetation and topsoil (tse) next to field N2 (which was planted with manioc). Photo (1–20 August 2017), Leonor Rodrigues.