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• W2345974613 abstract "Abstract. Ammonia (NH 3 ) emission from beef cattle feedyard manure results in losses of nitrogen (N), which may negatively affect air, soil, and water quality. The magnitude and rate of NH 3 volatilization from feedyards partially depends on the amount of urinary urea excreted and dissociation of ammonium (NH 4 + ) into NH 3 following urea hydrolysis. Zeolite clinoptilolite is a naturally occurring, porous aluminosilicate mineral that can sorb and sequester cations within its negatively charged framework structure. Zeolite has been used to mitigate NH 3 losses and improve fertilizer value of compost, sewage sludge, and manure in livestock barns; however, few studies have evaluated its efficacy on open-lot beef cattle feedyards. Zeolite application to pen surfaces could be a practical and cost-effective means of reducing NH 3 losses. Objectives of this study were to (1) characterize NH 4 + sorption by zeolites with differing physicochemical properties and (2) evaluate zeolite effects on rates and cumulative losses of NH 3 following application of artificial urine to feedyard manure. Batch incubation studies with four commercially available zeolites revealed that NH 4 + sorption by zeolite was rapid (1 to 2 h) with large differences in sorption potential largely related to zeolite pH. Maximum sorption ranged from 28 to 97 cmol NH 4 + -N kg -1 zeolite. Effects of zeolite application rate [0.5% to 10.0% of manure dry matter (DM)] on sorption and desorption characteristics in a manure/artificial urine matrix were highly variable but tended to be proportional to zeolite application rate: as little as 0.5% zeolite increased NH 4 + -N recovery by up to 19%. In flow-through chamber studies, higher rates of zeolite did not reduce cumulative NH 3 emissions, as 1.0% zeolite reduced cumulative NH 3 emission by 42% and 5.0% zeolite reduced N losses by only 18% compared to unamended manure. Surface application of zeolite has potential for mitigating feedyard NH 3 losses, but specific zeolite properties influenced its effectiveness. Further studies are warranted to evaluate effects of repeated zeolite application, co-application of zeolite and urease inhibitors, and cost:benefit ratios of zeolite application at commercial feedyards." @default.
• W2345974613 created "2016-06-24" @default.
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• W2345974613 date "2015-02-16" @default.
• W2345974613 modified "2023-09-23" @default.
• W2345974613 title "Can Surface-Applied Zeolite Reduce Ammonia Losses from Feedyard Manure? A Laboratory Study" @default.
• W2345974613 doi "https://doi.org/10.13031/trans.58.10965" @default.
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