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

J. E. Gilley, G. D. Boone, D. B. Marx

Research output: Contribution to journalArticle

Abstract

Beef cattle feedlots contain unconsolidated material that accumulates on the feedlot surface during a feeding cycle. This study was conducted to measure the effects of varying diameters of unconsolidated surface material and varying flow rates on nutrient concentrations in runoff. Unconsolidated surface material with an average diameter of 4.76, 9.53, 19.1, or 47.5 mm and a composite sample with a 15.2 mm mean diameter were placed within 0.75 m wide × 4.0 m long plot areas. 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), NH 4-N, and solids transport. Concentrations of DP, PP, TP, and NH 4-N for the composite material were 1.90, 1.28, 3.18, and 3.81 mg L-1, respectively, and solids transport was 19.8 g min-1. Runoff rate significantly affected concentrations of DP, PP, TP, NH 4-N, and solids transport 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, from 5.52 to 0.41 mg L-1, from 9.82 to 0.75 mg L -1, and from 25.8 to 0.49 mg L-1, respectively, as runoff rate increased from 0.02 to 1.10 L s-1. Nutrient concentrations of runoff from feedlot surfaces are affected by both varying diameters of unconsolidated surface material and varying flow rates.

Original languageEnglish (US)
Pages (from-to)749-759
Number of pages11
JournalTransactions of the ASABE
Volume57
Issue number3
DOIs
StatePublished - 2014

Keywords

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

ASJC Scopus subject areas

  • Forestry
  • Food Science
  • Biomedical Engineering
  • Agronomy and Crop Science
  • Soil Science

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