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Abstract
An investigation was carried out to screen and select efficient vesicular arbuscular mycorrhizal (VAM) fungi for two slow‐growing forest tree species, Acacia nilotica (Lam.) Willd. ex Delile and Calliandra calothyrsus Meissn. The seedlings were inoculated with 13 different VAM fungi, obtained from various sources around the world. Inoculated plants had greater plant height, leaf number, stem girth, biomass, and P and Zn content. They also had more mycorrhizal root colonization, spores, and external hyphae in soil. Acacia nilotica seedlings responded best to inoculation with Glomus mosseae (ICRISAT), followed by Glomus caledonicum, whereas Calliandra calothyrsus responded best to Glomus velum and Glomus merredum, both fungi being equally good.