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A fast-acting, natural source of soluble nutrients, high in nitrogen or phosphorus. Use on soil at 5 lb/100 sq ft or 300-500 lb/acre or make a tea from the powder and apply as a foliar. Note: Also see Seabird Guano. Excess application of high Nitrogen guano may burn your plants. This 9-3-1 formulation of Bat Guano is approved for Hawaii by HI Dept of Ag.