Preprint Article Version 1 This version is not peer-reviewed

Compost Quality Recommendations for Remediating Urban Soils

Version 1 : Received: 2 July 2019 / Approved: 4 July 2019 / Online: 4 July 2019 (11:36:40 CEST)

A peer-reviewed article of this Preprint also exists.

Heyman, H.; Bassuk, N.; Bonhotal, J.; Walter, T. Compost Quality Recommendations for Remediating Urban Soils. Int. J. Environ. Res. Public Health 2019, 16, 3191. Heyman, H.; Bassuk, N.; Bonhotal, J.; Walter, T. Compost Quality Recommendations for Remediating Urban Soils. Int. J. Environ. Res. Public Health 2019, 16, 3191.

Journal reference: Int. J. Environ. Res. Public Health 2019, 16, 3191
DOI: 10.3390/ijerph16173191

Abstract

Poor soil health is a critical problem in many urban landscapes. Degraded soil restricts plant growth and microorganism activity, limiting the ability of urban landscapes to perform much needed ecosystem services. Incorporation of approximately 33% compost by volume into degraded soil has been proven to improve soil health and structure over time while avoiding the financial and environmental costs of importing soil mixes from elsewhere. However, additions of high volumes of compost could potentially increase the risk of nutrient loss through leaching and runoff. The objective of our study was to consider the effects of different compost amendments on soil health, plant health and susceptibility to nutrient leaching in order to identify ranges of acceptable compost characteristics that could be used for soil remediation in the urban landscape. We conducted a bioassay with Phaseolus vulgaris (Bush Bean) to measure the effect of nine composts from different feedstocks on various plant health parameters. We collected leachate prior to planting to measure nutrient loss from each treatment. We found that all compost amendments improved soil health. Nutrient-rich, manure-based composts produced the greatest plant growth, but also leached high concentrations of nitrate and phosphorus. Some treatments provided sufficient nutrients for plant growth without excess nutrient loss. We concluded, when incorporating as much as 33% compost by volume into a landscape bed, the optimal compost will generally have a C:N ratio of 10-20, P-content <1.0% and a soluble salt content between 1.0 and 3.5 mmhos/cm. These recommendations should ensure optimal plant and soil health and minimize nutrient leaching.

Subject Areas

compost; compost quality; soil remediation; urban soil; nutrient leaching

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