Nitrogen mineralization rates in ten surface soils amended with (200 <i>μ</i>g N g<sup >−1</sup> soil) or without broiler litter were investigated. The soil-broiler litter mixture was incubated at <svg style="vertical-align:-1.09097pt;width:56.099998px;" id="M1" height="12.2375" version="1.1" viewBox="0 0 56.099998 12.2375" width="56.099998" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,12.2375)"> <g transform="translate(72,-62.21)"> <text transform="matrix(1,0,0,-1,-71.95,63.35)"> <tspan style="font-size: 12.50px; " x="0" y="0">2</tspan> <tspan style="font-size: 12.50px; " x="6.2515001" y="0">5</tspan> <tspan style="font-size: 12.50px; " x="15.278666" y="0">±</tspan> <tspan style="font-size: 12.50px; " x="26.618887" y="0">1</tspan> </text> <text transform="matrix(1,0,0,-1,-39.07,68.35)"> <tspan style="font-size: 8.75px; " x="0" y="0">∘</tspan> </text> <text transform="matrix(1,0,0,-1,-35.51,63.35)"> <tspan style="font-size: 12.50px; " x="0" y="0">C</tspan> </text> </g> </g> </svg> for 28 weeks. A nonlinear regression approach for N mineralization was used to estimate the readily mineralizable organic N pools (<svg style="vertical-align:-3.25792pt;width:17.5px;" id="M2" height="14.5375" version="1.1" viewBox="0 0 17.5 14.5375" width="17.5" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.5375)"> <g transform="translate(72,-60.37)"> <text transform="matrix(1,0,0,-1,-71.95,63.67)"> <tspan style="font-size: 12.50px; " x="0" y="0">N</tspan> </text> <text transform="matrix(1,0,0,-1,-62.92,60.55)"> <tspan style="font-size: 8.75px; " x="0" y="0">0</tspan> </text> </g> </g> </svg>) and the first-order rate constant (<i >k</i>). The cumulative N mineralized in the nonamended soils did not exceed 80 mg N kg<sup >−1</sup> soil. However, in Decatur soil amended with broiler litter 2, it exceeded 320 mg N kg<sup >−1</sup> soil. The greatest calculated <svg style="vertical-align:-3.25792pt;width:17.5px;" id="M3" height="14.5375" version="1.1" viewBox="0 0 17.5 14.5375" width="17.5" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.5375)"> <g transform="translate(72,-60.37)"> <text transform="matrix(1,0,0,-1,-71.95,63.67)"> <tspan style="font-size: 12.50px; " x="0" y="0">N</tspan> </text> <text transform="matrix(1,0,0,-1,-62.92,60.55)"> <tspan style="font-size: 8.75px; " x="0" y="0">0</tspan> </text> </g> </g> </svg> of the native soils was observed in Sucarnoochee soil alone (123 mg <svg style="vertical-align:-3.25792pt;width:39.349998px;" id="M4" height="14.75" version="1.1" viewBox="0 0 39.349998 14.75" width="39.349998" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.75)"> <g transform="translate(72,-60.2)"> <text transform="matrix(1,0,0,-1,-71.95,63.5)"> <tspan style="font-size: 12.50px; " x="0" y="0">N</tspan> <tspan style="font-size: 12.50px; " x="8.9021358" y="0">O</tspan> </text> <text transform="matrix(1,0,0,-1,-54.02,60.37)"> <tspan style="font-size: 8.75px; " x="0" y="0">3</tspan> </text> <text transform="matrix(1,0,0,-1,-47.06,68.5)"> <tspan style="font-size: 8.75px; " x="0" y="0">−</tspan> </text> </g> </g> </svg> kg<sup >−1</sup> soil) which when amended with broiler litter 1 reached 596 mg N kg<sup >−1</sup> soil. The added broiler litter mineralized initially at a fast rate (<i >k</i><sub>1</sub>) followed by a slow rate (<i>k</i><sub>2</sub>) of the most resistant fraction. Half-life of organic N remaining in the soils alone varied from 33 to 75 weeks and from 43 to 15 weeks in the amended soils. When <svg style="vertical-align:-3.25792pt;width:17.5px;" id="M5" height="14.5375" version="1.1" viewBox="0 0 17.5 14.5375" width="17.5" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.5375)"> <g transform="translate(72,-60.37)"> <text transform="matrix(1,0,0,-1,-71.95,63.67)"> <tspan style="font-size: 12.50px; " x="0" y="0">N</tspan> </text> <text transform="matrix(1,0,0,-1,-62.92,60.55)"> <tspan style="font-size: 8.75px; " x="0" y="0">0</tspan> </text> </g> </g> </svg> was regressed against soil organic N (<svg style="vertical-align:-0.17555pt;width:73.125px;" id="M6" height="11.9625" version="1.1" viewBox="0 0 73.125 11.9625" width="73.125" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,11.9625)"> <g transform="translate(72,-62.43)"> <text transform="matrix(1,0,0,-1,-71.95,62.66)"> <tspan style="font-size: 12.50px; " x="0" y="0">𝑟</tspan> <tspan style="font-size: 12.50px; " x="8.5645552" y="0">=</tspan> <tspan style="font-size: 12.50px; " x="20.604944" y="0">0</tspan> <tspan style="font-size: 12.50px; " x="26.856443" y="0">.</tspan> <tspan style="font-size: 12.50px; " x="29.982195" y="0">7</tspan> <tspan style="font-size: 12.50px; " x="36.233692" y="0">8</tspan> <tspan style="font-size: 12.50px; " x="42.485195" y="0">2</tspan> </text> <text transform="matrix(1,0,0,-1,-23.21,67.83)"> <tspan style="font-size: 8.75px; " x="0" y="0">∗</tspan> <tspan style="font-size: 8.75px; " x="4.5772958" y="0">∗</tspan> </text> </g> </g> </svg>) and C (<svg style="vertical-align:-0.17555pt;width:78.837502px;" id="M7" height="11.9625" version="1.1" viewBox="0 0 78.837502 11.9625" width="78.837502" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,11.9625)"> <g transform="translate(72,-62.43)"> <text transform="matrix(1,0,0,-1,-71.95,62.66)"> <tspan style="font-size: 12.50px; " x="0" y="0">𝑟</tspan> <tspan style="font-size: 12.50px; " x="8.5645552" y="0">=</tspan> <tspan style="font-size: 12.50px; " x="20.604944" y="0">0</tspan> <tspan style="font-size: 12.50px; " x="26.856443" y="0">.</tspan> <tspan style="font-size: 12.50px; " x="29.982195" y="0">8</tspan> <tspan style="font-size: 12.50px; " x="36.233692" y="0">8</tspan> <tspan style="font-size: 12.50px; " x="42.485195" y="0">4</tspan> </text> <text transform="matrix(1,0,0,-1,-23.21,67.83)"> <tspan style="font-size: 8.75px; " x="0" y="0">∗</tspan> <tspan style="font-size: 8.75px; " x="4.5772958" y="0">∗</tspan> <tspan style="font-size: 8.75px; " x="9.1545916" y="0">∗</tspan> </text> </g> </g> </svg>), positive linear relationships were obtained. The <svg style="vertical-align:-3.25792pt;width:17.5px;" id="M8" height="14.5375" version="1.1" viewBox="0 0 17.5 14.5375" width="17.5" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.5375)"> <g transform="translate(72,-60.37)"> <text transform="matrix(1,0,0,-1,-71.95,63.67)"> <tspan style="font-size: 12.50px; " x="0" y="0">N</tspan> </text> <text transform="matrix(1,0,0,-1,-62.92,60.55)"> <tspan style="font-size: 8.75px; " x="0" y="0">0</tspan> </text> </g> </g> </svg> pools increased with sand but decreased with silt and clay contents.