Effects of a Deep Layer of Mulch on the Soil Environment and Tree Root Growth    (View PDF)

Gary W. Watson and Gary Kupkowski

Abstract: After two years, no detrimental effects were found from application of 0.45 m (18 in) of wood chip mulch over soil in which the roots of trees were growing. Soil temperature, moisture and oxygen diffusion rate (ODR) were similar to soil without mulch. Root density in mulched soil was not different from unmulched soil; additional roots had proliferated into the mulch.

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https://doi.org/10.48044/jauf.1991.056