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Effect of vesicular-arbuscular mycorrhizal fungi and phosphate-solubilizing bacteria on growth and nutrition of soybean in a neutral-calcareous soil amended with32P-45Ca-tricalcium phosphate

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Summary

The interactions between vesicular-arbuscular (VA) mycorrhiza and phosphate-solubilizing bacteria (PSB) on the utilization of the sparingly soluble32P-45Ca-tricalcium phosphate byGlycine max-Rhizobium japonicum was studied in a neutral calcareous soil. Two mycorrhizal endophytes,Glomus mosseae and aGlomus sp. (E3), were assayed. Both of them increased plant growth and nutrition, E3 being the most efficient. Mycorrhizal inoculation, especially with E3, improved plant utilization of the sparingly soluble tricalcium phosphate. However, the proportion of P in the plant shoots derived from the fertilizer was lower in mycorrhizal plants. Although PSB inoculation did not improve fertilizer utilization by either roots or mycorrhizas, it did produce an increase in shoot N concentration and content, and in the shoot to root ratio. The amount of mycorrhizal infection was also increased by PSB at all levels of added phosphate.

This experiment confirms the significance of VA mycorrhizas on growth and P uptake by soybeans, and provides evidence of a key role of this symbiosis in P-cyccling in neutral calcareous soils.

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Azcon-Aguilar, C., Gianinazzi-Pearson, V., Fardeau, J.C. et al. Effect of vesicular-arbuscular mycorrhizal fungi and phosphate-solubilizing bacteria on growth and nutrition of soybean in a neutral-calcareous soil amended with32P-45Ca-tricalcium phosphate. Plant Soil 96, 3–15 (1986). https://doi.org/10.1007/BF02374991

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