Amara, D. S.2026-10-191996-05-01Amara, D. S., Sanginga, N., Danso, S. K. A., & Suale, D. S. (1996). Nitrogen contribution by multipurpose trees to rice and cowpea in an alley cropping system in Sierra Leone. Agroforestry Systems, 34(2), 119–128. https://doi.org/10.1007/bf0014815610.1007/bf00148156https://doi.org/10.1007/bf00148156https://dspace.njala.edu.sl/handle/20.500.144402/1730enMetadata only. Full text is not deposited in this repository; it is available from the publisher: https://doi.org/10.1007/bf00148156nitrogen contributionArticle