This material provides an overview of fertilizer application equipment, specifically focusing on ground-operated dry fertilizer distributors. Different fertilizer application systems are discussed, including broadcast application equipment, spinner and boom-type spreaders, and full-width distributors. The material describes the features and mechanisms of these equipment types, highlighting their usage, design variations, and performance characteristics. Factors affecting distribution patterns, such as particle size, density, and segregation, are also discussed. The accuracy and variability of application rates for different feed mechanisms are examined, emphasizing the importance of considering fertilizer density in adjusting application rates. The document concludes with the findings of performance tests conducted on various distributors, indicating the variability in application rates across a hypothetical field.