Abstract
Nitrogen from poultry manure (PM) and ammoniacal fertilizers undergoes rapid nitrification upon addition to soils, making it highly susceptible to leaching and thus creating a potential for groundwater contamination by nitrate-N. Any management technique that could delay nitrification would be desirable. A laboratory incubation study was conducted to determine the effect of thiosulfate, a known nitrification inhibitor, on nitrification in a loamy sand soil amended with five N sources, including two poultry manures and three N fertilizers [(NH4)2SO4, NH4NO3, CO(NH2)2]. The manures or fertilizers were added to a soil-sand mixture alone or in combination with Na2S2O at a rate of 100 mg N kg-1 for the inorganic N sources and 147 mg N kg-1 and 122 mg N kg-1 for PM-1 and PM-2 respectively. All treatments were incubated for 12 weeks and analyzed periodically for NO3-N and NH4-N.
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