For example: we have done side-by-side testing of nutrient strength with Urban Farm Liquid Fertilizers vs the bigger 20-20-20 dry powders in the business. Organic Fertilizer Sources for the Garden. A fertilizer formula of 10-30-10 or 10-20-20 NPK is recommended 2 oz (about 60 g) each for young plants and 1/5 lb (100 g) each for adults, plus minor elements at the rate of 1 oz (30 g) per tree every 6 months. If this happens, use distilled water.
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