Certified Professional Horticulturist (CPH) Practice Exam

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Which material is not suitable for composting?

  1. Egg Shells

  2. Farm Animal manure

  3. Cat Manure

  4. Vegetable Scraps

The correct answer is: Cat Manure

Cat manure is not suitable for composting primarily due to the potential health risks it poses. It can contain pathogens and parasites, such as Toxoplasma gondii, which can survive in composting conditions and pose a threat to humans and other animals. In contrast, the other materials listed—egg shells, farm animal manure, and vegetable scraps—are commonly used in composting. Egg shells provide calcium, farm animal manure is a nutrient-rich resource that can enhance microbial activity, and vegetable scraps are a significant carbon source, improving the overall balance of the compost pile. Therefore, while the other materials are beneficial and safe for composting, cat manure introduces significant risks, making it unsuitable.

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