liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Excess phosphorus from compost applications in urban gardens creates potential pollution hotspots
Biology Department, University of St. Thomas, Saint Paul, MN, 55105, United States of America.
Biology Department, University of St. Thomas, Saint Paul, MN, 55105, United States of America.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Biology.
Biology Department, University of St. Thomas, Saint Paul, MN, 55105, United States of America.
Show others and affiliations
2019 (English)In: Environmental Research Communications, Vol. 1, no 9Article in journal (Refereed) Published
Abstract [en]

Urban sustainability initiatives often encompass such goals as increasing local food production, closing nutrient loops through recycling organic waste, and reducing water pollution. However, there are potential tradeoffs among these desired outcomes that may constrain progress. For example, expansion of urban agriculture for food production may create hotspots of nutrient pollution if nutrient recycling is inefficient. We used gardener and urban farmer survey data from the Twin Cities Metropolitan Area (Minnesota, USA) to characterize phosphorus (P) and nitrogen (N) inputs and harvest in order to determine nutrient use efficiencies, and measured soil P concentrations at a subset of these sites to test whether excess soil P was common. All survey respondents (n = 142) reported using some form of soil amendment, with plant-based composts being the most common. Median application rates were 300 kg P/ha and 1400 kg N/ha. Median nutrient use efficiencies were low (2.5% for P, 5.0% for N) and there was only a weak positive relationship between P and N inputs and P and N harvested in crop biomass. Garden soils had a median Bray P value of 80 ppm, showing a buildup of plant-available P far exceeding recommended levels. Our results show that urban gardens are characterized by high nutrient inputs and inefficient conversion of these nutrients into crops, leading to buildup and potential loss of P and N from garden soils. Although urban gardens make up only 0.1% of land area in the Twin Cities, compost application to these urban gardens still constitutes one of the largest inputs of P to the watershed. In order to maximize desired outcomes from the expansion of urban agriculture (UA), it will be necessary to target soil amendments based on soil nutrient levels and crop nutrient demand.

Place, publisher, year, edition, pages
IOP Publishing , 2019. Vol. 1, no 9
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-160850DOI: 10.1088/2515-7620/ab3b8cOAI: oai:DiVA.org:liu-160850DiVA, id: diva2:1359963
Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-10

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full texthttps://doi.org/10.1088%2F2515-7620%2Fab3b8c

Search in DiVA

By author/editor
Metson, Geneviève Suzanne
By organisation
Theoretical Biology
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 2 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf