Studies on the effect of ecto and endomycorrhizal inoculums on seedling growth of four savanna tree seeds in Nigeria. Endomycorrhizae (Glomus mossae) and ectomycorrhizae (Saillus luteus); both were used in crude forms. The relative endomycorrhizal dependency of the seedlings were maximum in P. biglobossa seedlings by having up to 68%, 41.0% in Albizia, 35.0% in T. indica and the least was 21% in P. africana seedlings. However, T.indica seedlings had the highest ectomycorrhizal dependency with

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... out 55.0%, while 54.0% was showed in P. africana. About 50.0% and 46.0% were shown in A. lebbeck and P. biglobossa seedlings respectively. Ectomycorrhizal inoculation greatly enhanced seedling growth and development of Prosopis africana, A. lebbeck, T. indica, P. biglobossa had the highest significant difference (p<0.05) in leaf area at treatment. Endomycorrhizal inoculation also greatly enhanced seedling growth of P. africana, A. lebbeck and T. indica, P. biglobossa had highest significant difference (P<0.05) in leaf area, leaf number, petiol length, stem girth and plant heights in the treatment. Treatment means were separated using least significant difference at 5% probability level. The results obtained in this study will foster valuable contributions in the areas of increasing the seedling growth of these savanna tree seeds through the incorporation of both ecto and endomycorrhizae into the soil. These findings will also assist to increase seedling production for agro forestry purposes in Nigeria.