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the australian farmer
Compared to synthetic fertilisers like MAP and Urea, vermicast provides nutrients in a fundamentally differ- ent, slower-release form and focuses on long-term soil health rather than an immediate nutrient boost. • Nutrient Release and Efficiency : Urea and MAP release their nutrients (especially nitro- gen and phosphorus) rapidly, which can lead to leaching, volatilization (loss to the air), and inefficient uptake by plants. Studies show only 20-25% of applied urea nitrogen may be avail- able to plants. Vermicast releases nutrients slowly and steadily over months, drastically re- ducing waste and pollution. • Nutrient Form and Availability : While MAP and Urea provide high concentrations of im- mediately available N, P, and K, vermicast of- fers a broad spectrum of nutrients (macro and micro) in a highly bioavailable, water-soluble form due to the worms' digestive process. It also contains plant growth hormones and en- zymes that synthetic fertilisers lack. • Soil Health : This is the key difference. Urea and MAP do nothing to improve soil structure or biology and can degrade soil health over time. Vermicast is a powerful soil conditioner that dra- matically improves water retention, aeration, and, most importantly, introduces a vast popu- lation of beneficial microbes that enhance nutri- ent cycling and plant disease resistance. • Synergy : Research shows the best results often come from combining them. Using vermicast with a reduced amount of urea or MAP creates a synergistic effect: the synthetic fertiliser pro- vides an immediate nutrient kick, while the ver- micast stabilizes the nutrients, improves root development, and ensures sustained release, leading to higher yields and better plant health than either used alone than either used alone. In short, vermicast is not a direct, high-volume re- placement for MAP or Urea, but a superior long- term investment in soil fertility and plant resilience. While vermicast is an excellent soil conditioner and source of slowly released, bioavailable nutri- ents, it does not contain the high concentration of
nitrogen (N) that urea provides. Urea is a concen- trated nitrogen source (46-0-0 NPK), whereas ver- micast has a much lower and more balanced nutri- ent profile (often around 1-0.5-0.5 NPK). Vermicast's primary value lies in improving soil health, structure, and microbial life, which enhan- ces the plant's ability to absorb all nutrients, in- cluding those from other sources. For high-yield crop production, especially for nitrogen-demand- ing plants, relying solely on vermicast would likely result in nitrogen deficiency. The most effective ap- proach is to use vermicast in combination with urea or other fertilisers, allowing the vermicast to stabil- ize the nitrogen, reduce leaching, and improve overall plant health and resilience. To supplement vermicast with higher NPK, espe- cially nitrogen, consider this non-synthetic fertiliser: • Seabird Guano: Offers high nitrogen and phos- phorus (e.g., Seabird Guano ~10-10-0), provid- ing a powerful, fast-acting organic boost. Sea- bird Guano can be blended with vermicast to create a potent, natural fertiliser that delivers both immediate and long-term nutrients while improving soil health.
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