Summary
A field study carried out in a sandy, relatively acid Senegalese soil with a low soluble P content (7 ppm) and low vesicular-arbuscular mycorrhizal (VAM) populations showed that soybean responded toGlomus mosseae inoculation when the soluble P level in the soil had been raised by the addition of 22 kg P ha−1. In P-fertilized plots, N2 fixation of soybean, assessed by the A value method, was 109 kg N2 fixed hat when plants were inoculated withRhizobium alone and it reached 139 kg N2 fixed ha−1 when plants were dually inoculated withRhizobium andGlomus mosseae using an alginate bead inoculum. In addition to this N2 fixation increase (+28%),Glomus mosseae inoculation significantly improved grain yield (+13%) and total N content of grains (+16%). This success was attributed mainly to the low infection potential of the native VAM populations in the experimental site. In treatments without solubleP or with rock phosphate, no effect of VAM inoculation was observed.
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Ganryl, F., Diem, H.G., Wey, J. et al. Inoculation withGlomus mosseae improves N2 fixation by field-grown soybeans. Biol Fert Soils 1, 15–23 (1985). https://doi.org/10.1007/BF00710966
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DOI: https://doi.org/10.1007/BF00710966