About the Authors

Anthony J. Mills

mills@sun.ac.za

Affiliation Department of Soil Science, Stellenbosch University, Matieland, South Africa

Antoni V. Milewski

Affiliation Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch, South Africa

Dirk Snyman

Affiliation C4 EcoSolutions, Tokai, South Africa

Jorrie J. Jordaan

Affiliation University of Limpopo, Sovenga, South Africa

Competing Interests

The authors have declared that no competing interests exist. The author Dirk Snyman holds a commercial affiliation, being employed by C4 EcoSolutions. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: AJM AVM DS. Data curation: DS. Formal analysis: AJM DS. Funding acquisition: AJM. Investigation: AJM AVM JJJ. Methodology: AJM AVM. Project administration: AJM JJJ. Resources: AJM JJJ. Software: AJM DS. Supervision: AJM JJJ. Validation: AJM. Visualization: AJM AVM DS. Writing – original draft: AJM AVM. Writing – review & editing: AJM AVM JJJ.