The core of composting is the beneficial decomposition of organic materials by microorganisms; not all waste is suitable for composting. Even with organic fertilizer composting equipment, improper addition of items can disrupt the compost balance, breed harmful substances, and even lead to compost ineffectiveness and soil pollution.

Kitchen Waste Prohibited: Grease, fatty meat, animal offal, and dairy products should not be added to the compost pile. These materials decompose slowly, easily clump together, and even with a compost turning machine, aeration is difficult to improve. They also easily attract flies and emit foul odors. Kitchen waste with excessive salt and sugar content will inhibit microbial activity, causing composting to stagnate and affecting fertilizer efficiency.

Chemicals and Synthetic Substances Strictly Prohibited: Non-degradable materials such as plastics and glass will leave residues in the compost, polluting the soil and potentially damaging equipment parts, clogging organic fertilizer production lines, and hindering commercial processing. Cleaning agents and pesticide residues contain chemical toxins that will kill beneficial bacteria and harm crops and human health; used batteries contain heavy metals, which will cause soil contamination.

Special organic waste. Plant residues carrying pathogens and pet feces may carry insect eggs and pathogens, which are difficult to completely kill with the high temperatures of ordinary organic fertilizer composting equipment. Even after thorough turning with a compost turning machine, pests and diseases can still easily spread. Mature weed seeds may not be inactivated after being added to the compost pile, leading to excessive weed growth in the field after application.

Composting must adhere to the principle of "natural organic, no harmful residues," using only safe materials such as straw, vegetable leaves, and ordinary livestock and poultry manure to ensure compost quality and avoid secondary pollution.