Nutrient concentrations of runoff as affected by the diameter of unconsolidated materials from feedlot surfaces

John E. Gilley, Gregory D. Boone, David B. Marx

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Beef cattle feedlots contain unconsolidated material that accumulate on the feedlot surface during a feeding cycle. This study was conducted to: (1) determine the effects of varying diameter of unconsolidated surface material on nutrient concentrations of runoff and (2) identify the effects of selected runoff rates on nutrient concentrations of runoff from unconsolidated surface material containing variable particle diameters. Unconsolidated surface material with a mean diameter of 4.76, 9.53, 19.1 or 47.5 mm and a composite sample with a 10.8 mm mean diameter were placed within a 0.75 m wide by 4.0 m long plot area. Flow was then introduced at the top of the plots in successive increments and runoff samples for water quality analyses were obtained. Particle diameter significantly influenced runoff concentrations of dissolved phosphorus (DP), particulate phosphorus (PP), total phosphorus (TP), and NH4-N. Concentrations of DP, PP, TP and NH4-N for the composite material were 1.90, 1.28, 3.18, and 3.81 mg L-1, respectively. Runoff rate also significantly affected concentrations of DP, PP, TP, and NH4-N for each of the particle size classes except the 4.76 mm diameter material. For the composite material, concentrations of DP, PP, TP, and NH4-N decreased from 4.30 to 0.34 mg L-1, 5.52 to 0.41 mg L-1, 9.82 to 0.75 mg L-1, and 25.8 to 0.49 mg L-1, respectively, as runoff rate increased from 0.02 to 1.10 L sec-1. Thus, both the diameter of unconsolidated material from feedlot surfaces and runoff rate may significantly influence nutrient concentrations of runoff.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
PublisherAmerican Society of Agricultural and Biological Engineers
Pages1582-1593
Number of pages12
ISBN (Print)9781622762088
StatePublished - Jan 1 2012
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012 - Dallas, TX, United States
Duration: Jul 29 2012Aug 1 2012

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
Volume2

Conference

ConferenceAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
CountryUnited States
CityDallas, TX
Period7/29/128/1/12

Keywords

  • Beef cattle
  • Feedlots
  • Manure management
  • Manure runoff
  • Nitrogen movement
  • Nutrient losses
  • Phosphorus
  • Runoff
  • Water quality
  • Water quality management

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Bioengineering

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  • Cite this

    Gilley, J. E., Boone, G. D., & Marx, D. B. (2012). Nutrient concentrations of runoff as affected by the diameter of unconsolidated materials from feedlot surfaces. In American Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012 (pp. 1582-1593). (American Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012; Vol. 2). American Society of Agricultural and Biological Engineers.