Relative role of transport and source-limited controls for estrogen, TDP, and DOC export for two manure application methods

•Estrogens, TDP, and DOC were monitored for 9 months after fall manure application.•Transport dynamics for surface broadcast and shallow disk injection were compared.•Solute-limited drivers controlled estrogen transport for both application methods.•Transport-limited drivers controlled TDP and DOC t...

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Bibliographic Details
Published in:Agriculture, ecosystems & environment ecosystems & environment, 2017-09, Vol.247, p.308-318
Main Authors: Mina, O., Gall, H.E., Saporito, L.S., Elliott, H.A., Kleinman, P.J.A.
Format: Article
Language:English
Subjects:
Agricultural land
Agricultural practices
Agrochemicals
Agroecosystems
Animal wastes
Anthropogenic factors
Biogeochemistry
Coefficient of variation
Contaminants
Control methods
Dairy manure
Data analysis
Data processing
Dilution
Discharge
Dissolved organic carbon
Dissolved organic phosphorus
Estrogens
Exports
Fate and transport
Fertilizers
Hydrology
Manures
Mitigation
Nutrients
Phosphorus
Pollutants
Pollution dispersion
Pollution load
Runoff
Soil contamination
Studies
Surface runoff
Transport
Water pollution
Water quality
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Summary:•Estrogens, TDP, and DOC were monitored for 9 months after fall manure application.•Transport dynamics for surface broadcast and shallow disk injection were compared.•Solute-limited drivers controlled estrogen transport for both application methods.•Transport-limited drivers controlled TDP and DOC transport for both methods.•Site history may affect the dominant roles of transport vs. solute-limited controls. Developing successful mitigation strategies for emerging contaminants can be difficult due to incomplete understanding of factors controlling their fate and transport. A variety of data analysis techniques can be used to assess the fate and transport behavior of pollutants in runoff water. Here, we use concentration-discharge, load-discharge, and coefficient of variation relationships to examine how two methods of dairy manure application (surface broadcast and shallow disk injection) affect the transport dynamics of estrogens, total dissolved phosphorus (TDP), and dissolved organic carbon (DOC). Nine surface runoff events were sampled from Oct 2014–June 2015 from 12 research plots (six with each application method) in Central Pennsylvania after fall application. The plots received inorganic fertilizer for 15 years, but only four manure applications since 2012. Both TDP and DOC exhibited similar transport behavior under both manure application methods that indicate transport-limited control of export, potentially due to legacy sources in soils. However, estrogen loads exhibited dilution responses, a sign of source-limited controls. The strength of the dilution response for estrogens was greater for surface applied manure relative to the injected manure, suggesting that manure application methods can be used to control the mobilization potential of estrogens. Additionally, results suggest the longer-term application history of inorganic fertilizer led to the transport-limited dynamics exhibited by TDP, while the short-term application history of manure caused estrogen transport to be source-limited. Our findings provide insight into how anthropogenic drivers (application type, method, and history) and natural drivers (hydrology, biogeochemistry) are interconnected in agricultural fields, and point to opportunities for protecting downstream water quality.
ISSN:0167-8809
1873-2305
DOI:10.1016/j.agee.2017.06.045