Nitrogen transformation from three soil organic amendments in a sandy soil |
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| Authors: | Ashok K Alva Siva Paramasivam Kenneth S Sajwan |
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| Institution: | 1. USDA-ARS , Prosser, Washingtonaalva@pars.ars.usda.gov;3. Savannah State University, Environmental Sciences &4. Biotech Research , Savannah, Georgia, USA |
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| Abstract: | Abstract A sandy soil was amended with various rates (20 – 320 g air-dry weight basis of the amendments per kg of air-dry soil) of chicken manure (CM), sewage sludge (SS), and incinerated sewage sludge (ISS) and incubated for 100 days in a greenhouse at 15% (wt/wt) soil water content. At the beginning of incubation, NH4-N concentrations varied from 50 – 280 mg kg?1 in the CM amended soil with negligible amounts of NO3-N. Subsequently, the concentration of NH4-N decreased while that of NO3-N increased rapidly. In soil amended with SS at 20 – 80 g kg?1 rates, the NO3-N concentration increased sharply during the first 20 days, followed by a slow rate of increase over the rest of the incubation period. However, at a 160 g kg?1 SS rate, there were three distinct phases of NO3-N release which lasted for160 days. In the ISS amended soil, the nitrification process was completed during the initial 30 days, and the concentrations of NH4-N and NO3-N were lower than those for the other treatments. The mineralized N across different rates accounted for 20 – 36%, 16 – 40%, and 26 – 50% of the total N applied as CM, SS, and ISS, respectively. |
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| Keywords: | Nitrogen mineralization sewage sludge chicken manure incinerated sewage sludge nitrogen immobilization |
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