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المؤلفون: E.U. Onweremadu, F.O.R. Akamigbo, C. A Igwe, E.C. Matthews-N, P.C. Obasi
المصدر: International Journal of Agricultural Research. 2:712-718
مصطلحات موضوعية: Soil survey, Geography, Agroforestry, Soil Science, Plant Science, Arable land, Agronomy and Crop Science, Humid tropics