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The following references may be useful when improving this article in the future:
Sileshi, G. W.; Mafongoya, P. L.; Akinnifesi, F. K.; Phiri, E.; Chirwa, P.; Beedy, T.; Makumba, W.; Nyamadzawo, G.; Njoloma, J. (2014-01-01), Van Alfen, Neal K. (ed.), "Agroforestry: Fertilizer Trees", Encyclopedia of Agriculture and Food Systems, Oxford: Academic Press, pp. 222–234, doi:10.1016/b978-0-444-52512-3.00022-x, ISBN978-0-08-093139-5, retrieved 2023-10-14
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Prior content in this article duplicated one or more previously published sources. The material was copied from: https://doi.org/10.1016/B978-0-444-52512-3.00022-X. Copied or closely paraphrased material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.)