Effects of Aluminum from Water‐Treatment‐Residual Applications to Pastures on Mineral Status of Grazing Cattle and Mineral Concentrations of Forages

R. K. Madison Department of Animal Sciences, University of Florida, Gainesville, Florida, USA

L. R. McDowell Department of Animal Sciences, University of Florida, Gainesville, Florida, USACorrespondence[email protected]

G. A. O'Connor Department of Soil and Water Science, University of Florida, Gainesville, Florida, USA

N. S. Wilkinson Department of Animal Sciences, University of Florida, Gainesville, Florida, USA

P. A. Davis Department of Animal Sciences, University of Florida, Gainesville, Florida, USA

Adegbola T. Adesogan Department of Animal Sciences, University of Florida, Gainesville, Florida, USA

Tara L. Felix Department of Animal Sciences, University of Florida, Gainesville, Florida, USA

Meghan Brennan Department of Statistics, University of Florida, Gainesville, Florida, USA

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Abstract

Aluminum (Al) applied to land in the form of water treatment residuals (Al‐WTR) can reduce soluble soil phosphorus (P). Two experiments (145 and 148 d) using 36 grazing Holstein steers were conducted to determine effects of Al‐WTR applications to pasture on mineral status of cattle and bahiagrass (Paspalum notatum). Four treatments were with and without Al‐WTR and P‐free mineral supplementation. Total pasture application of Al‐WTR over 2 years was 75.8 metric tons dry weight/ha. There were few treatment effects on weight gains and mineral tissue concentrations. Forage mineral concentrations were generally unaffected by treatment but were affected (P < 0.05) by collection dates. Most forage samples were deficient in sodium (Na), copper (Cu), selenium (Se), and cobalt (Co) and at various collections deficient in calcium (Ca), P, iron (Fe), and zinc (Zn). Applications of Al‐WTR are effective in reducing P contamination without affecting forage or cattle mineral concentrations.

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Effects of Aluminum from Water‐Treatment‐Residual Applications to Pastures on Mineral Status of Grazing Cattle and Mineral Concentrations of Forages

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