Soil CO 2 response to organic and amino acids

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Abstract

Soil samples were obtained from under actively growing Austrian winter peas and from 2 m away in a plot that had no winter peas or other legumes growing in its cover crop mix. Soils were treated with 5 carbon (C) compounds (oxalic, malic, citric, glycine and arginine) and a control (deionized water). Microbial response was measured using an automated soil respiration system (ASRS). The soil under winter peas evolved a higher amount of CO 2 than the soil without winter peas across all treatments. The winter peas soil showed an increased response to oxalic and citric acids indicating that these compounds may be released by winter peas and that the microbial community is adept at assimilating them. We may be able to determine the C compounds and associated vegetation to which the indigenous microbial population is frequently exposed. Cover crop recommendations may be made based on microbial response rates to increase the diversity of the microbial community and health of the soil.

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Haney, R. L., Haney, E. B., White, M. J., & Smith, D. R. (2018). Soil CO 2 response to organic and amino acids. Applied Soil Ecology, 125, 297–300. https://doi.org/10.1016/j.apsoil.2017.12.016

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