Ammonium-nitrogen transformation and nitrogen retention in broiler manure supplemented with a soil amendment containing nitrifying bacteria

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Abstract

The effect of a soil amendment on ammonium nitrogen transformation and nitrogen retention in broiler manure was evaluated. Prior to incubation, broiler manure was mixed with autoclaved soil or non-autoclaved soil in different ratios to make 1 kg mixtures; broiler manure:non-autoclaved soil = 9:1, 5:5, and 1:9 or broiler manure:autoclaved soil = 9:1, 5:5, and 1:9. The non-autoclaved soil treatment reduced either numerically or significantly NH4 +-N concentration compared to the autoclaved soil treatment during the 8-wk incubation. Total-N concentration of the non-autoclaved soil treatments was lower than the autoclaved soil treatments from 4 to 8 wk. The lowest manure to non-autoclaved soil treatment (M:S = 1:9) had considerably more nitrite and nitrate; however, the higher ratio manure to non-autoclaved soil treatments (M:S = 9:1 and 5:5) had slightly higher total nitrite and nitrate levels compared to the same ratio of autoclaved soil treatments. The moisture level of the 9:1, 5:5, and 1:9 M:S treatments were approximately 70, 45, and 30%, respectively. The results indicated that nitrifying bacteria in the non-autoclaved soil reduced the ammonium nitrogen concentrations of poultry manure by converting NH3 or NH4+ to NO2- or NO3-. However, the higher moisture levels in treatments with greater manure to soil ratios (M:S = 9:1 and 5:5) created anaerobic conditions that allowed for denitrification and greater N losses.

Original languageEnglish (US)
Pages (from-to)121-133
Number of pages13
JournalJournal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Volume41
Issue number2
DOIs
StatePublished - Mar 1 2006

All Science Journal Classification (ASJC) codes

  • Food Science
  • Pollution

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