title: Subsurface cadmium loss from a stony soil-effect of cow urine application.
abstract: Cadmium (Cd) losses in subsurface flow from stony soils that have received cow urine are potentially important, but poorly understood. This study investigated Cd loss from a soil under a winter dairy-grazed forage crop that was grazed either conventionally (24 h) or with restricted grazing (6 h). This provided an opportunity to test the hypothesis that urine inputs could increase Cd concentrations in drainage. It was thought this would be a result of cow urine either (i) enhancing dissolved organic carbon (DOC) concentrations via an increase in soil pH, resulting in the formation of soluble Cd-organic carbon complexes and, or (ii) greater inputs of chloride (Cl) via cow urine, promoting the formation of soluble Cd-Cl complexes. Cadmium concentrations in subsurface flow were generally low, with a spike above the water quality guidelines for a month after the 24-h grazing. Cadmium fluxes were on average 0.30 g Cd ha-1year-1(0.27-0.32 g Cd ha-1year-1), in line with previous estimates for agricultural soils. The mean Cd concentration in drainage from the 24-h grazed plots was significantly higher (P < 0.05) than 6-h plots. No increase in DOC concentrations between the treatments was found. However, Cl concentrations in drainage were significantly higher (P < 0.001) from the 24-h than the 6-h grazed treatment plots, and positively correlated with Cd concentrations, and therefore, a possible mechanism increasing Cd mobility in soil. Further study is warranted to confirm the mechanisms involved and quantities of Cd lost from other systems.
authors.affiliation: AgResearch, Lincoln Research Centre, Private Bag 4749, Christchurch, New Zealand. colin.gray@agresearch.co.nz.
authors.forename: Colin William
authors.initials: CW
authors.lastname: Gray
authors.affiliation: AgResearch, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand.
authors.forename: Jane Marie
authors.initials: JM
authors.lastname: Chrystal
authors.affiliation: AgResearch, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand.
authors.forename: Ross Martin
authors.initials: RM
authors.lastname: Monaghan
authors.affiliation: Landcare Research, Gerald Street, PO Box 69040, Lincoln, 7640, New Zealand.
authors.forename: Jo-Anne
authors.initials: JA
authors.lastname: Cavanagh
mesh_terms: D000383:Agriculture; D000818:Animals; D002104:Cadmium; D002417:Cattle; D005260:Female; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants; D014556:Urine
chemical_list: D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium
keywords: Cadmium; Chloride; DOC; Leaching; Urine; pH