Which type of turf fertilizer includes both synthetic and natural sources?

• A. Organic fertilizers
• B. Inorganic fertilizers
• C. Natural organic fertilizers
• D. Synthetic fertilizers

Answer: (C)

The idea being tested is how fertilizer sources are described and blended. Natural organic fertilizers are designed to come from natural materials, yet they can be formulated to include additional, readily available nutrients, effectively mixing natural matter with nutrient sources that may be synthetic. This combination is what sets them apart from strictly natural organic options and strictly synthetic options, making them the best choice when a fertilizer is described as containing both natural and synthetic sources. The other categories point to either purely natural materials (organic fertilizers) or purely manufactured nutrients (inorganic or synthetic fertilizers), which don’t emphasize that blend of sources.