What is the nutrient-rich material earthworms excrete after processing organic matter?
Answer
Castings
The material excreted by earthworms after they ingest and digest soil rich in decaying organic matter is known specifically as castings. This process is the core mechanism of natural fertilization and soil enrichment performed by these invertebrates. As the organic material passes through their digestive tracts, it is mixed with mucus, bacteria, and enzymes. The resulting castings are highly valued by horticulturists because they are significantly more nutrient-rich and possess a superior physical structure compared to the raw input materials, thereby greatly improving soil quality and fertility for plant growth.
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