Pu, G.X. and Barry, G. and Bell, M. (2010) Gaseous Nitrogen Losses Following Soil Amendment with Biosolids under Controlled Conditions. Journal of Residuals Science & Technology, 7 (4). pp. 209-217.
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This paper quantifies gaseous N losses due to ammonia volatilisation and denitrification under controlled conditions at 30 degrees C and 75% to 150% of Field Capacity (FC). Biosolids were mixed with two contrasting soils from subtropical Australia at a rate designed to meet crop N requirements for irrigated cotton or maize (i.e., equivalent to 180 kg N ha(-1)). In the first experiment, aerobically (AE) and anaerobically (AN) digested biosolids were mixed into a heavy Vertosol soil and then incubated for 105 days. Ammonia volatilization over 72 days accounted for less than 4% of the applied NH4-N but 24% (AN) to 29% (AE) of the total applied biosolids' N was lost through denitrification in 105 days. In the second experiment AN biosolids with and without added polyacrimide polymer were mixed with either a heavy Vertosol or a lighter Red Ferrosol and then incubated for 98 days. The N loss was higher from the Vertosol with 16-29% of total N applied versus the Red Ferrosol with 7-10% of total N applied, while addition of polymer to the biosolids increased N loss from 7 to 10% and from 16 to 29% in the Red Ferrosol and Vertosol, respectively. A major product from the denitrification process was N-2 gas, accounting for >90% of the emitted N gases from both experiments. Our findings demonstrate that denitrification could be a major pathway of gaseous N losses under warm and moist conditions.
|Additional Information:||© DEStech Publications, Inc.|
|Keywords:||Inorganic nitrogen; denitrification; volatilization; pastures; legume; water; field; soils; N-2; Australia.|
|Subjects:||Plant culture > Field crops|
Agriculture > Agriculture (General) > Soils. Soil science
|Deposited On:||01 Mar 2011 02:50|
|Last Modified:||29 Mar 2011 00:46|
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