DEVELOPMENT OF A NITROGEN-RELEASE ALGORITHM FOR SLOW-RELEASE FERTILIZERS

Urban Farm DB summary

This study developed a first-order decay equation to model the nitrogen release rate of sulfur-coated ureas (SCUs), prevalent in urban agricultural management. The model was fit with reasonable accuracy for both surface (Efficiency R²=0.63) and incorporated (Efficiency R²=0.70) applications. Temperature and seven-day dissolution were determined as best descriptive parameters for the surface model, while soil moisture and temperature were used for the incorporated model. Each model was validated with a limited amount of data, showing prediction efficiencies of 0.82 for surface and 0.63 for subsurface applications.