Nitrogen Mineralization and Phosphorus Release from Composts and Soil Conditioners found in the Southeastern United States

Composts and soil conditioners may be useful soil amendments to provide organic matter as well as nutrients such as N and P, but net N mineralized and P released can vary greatly among materials. Consequently, it is important to identify the material characteristics that control these processes. Furthermore, the magnitude of these processes may be affected by particle size. We conducted two laboratory studies at 30°C to: (i) identify variables that can be used to estimate N mineralized and Mehlich‐1 P released from 14 composts and soil conditioners; and (ii) evaluate net N mineralized from three size fractions (