Vermicompost: Why are they called the “King of Organic Fertilizers”?

The primary difference between vermicompost and conventional livestock manures (such as chicken or cattle manure) lies in the "biological processing" they undergo within the earthworm's digestive tract, resulting in a qualitative leap in their physicochemical properties. 1.More Comprehensive Nutrient Profile Conventional organic fertilizers typically have a total N-P-K content of about 4–5%, serving primarily to replenish organic matter. In contrast, vermicompost can reach 7.6% total nutrients, with organic matter and humus content ranging from 46% to 78%. They also contain 16–18 types of amino acids and abundant beneficial bacteria (up to 200 million CFU/g), as well as humic acid and plant growth hormones—compositional advantages that ordinary manure composts cannot match. 2.Higher Safety Conventional manures require high-temperature composting; otherwise, they may undergo secondary fermentation in the soil, releasing toxic gases and burning root systems. Vermicompost is inherently highly stable; they can be applied directly without burning seedlings and are safe for use in seedling propagation. Research indicates that they outperform cattle manure treatments (at the same application rate) by 25–73% in terms of promoting plant growth and enhancing soil enzyme activity. 3.Superior Physical Properties Vermicompost appears as black, granular aggregates; they are odorless, porous, and offer excellent aeration, drainage, and water-holding capacity. The surface area of the organic matter particles increases more than a hundredfold after passing through the earthworm's digestive system, fundamentally alleviating soil compaction and enhancing the soil's ability to retain water and nutrients. Vermicompost has low moisture content (30–40%), allowing processing to bypass solid-liquid separation and high-temperature drying stages. The recommended core equipment is a double roller press granulator, which enables direct processing without binders while retaining over 95% of the organic matter. When paired with a fertilizer ball shaping machine, the pelletization rate reaches 85–95%, producing smooth, aesthetically pleasing granules. The entire production line is shorter and more energy-efficient than conventional organic fertilizer production lines—a processing advantage derived from the high quality of the raw material.