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How to buy organic dry fertilizers
Test your soil's ph and nutrient levels.
Before selecting an organic dry fertilizer, use a soil testing kit to find out what kinds of amendments your soil needs. Buy a home soil test kit from your local garden center, or send a sample to a soil testing lab near you.
Use a test kit or request a lab test that shows both soil ph and nutrient levels. Many universities offer soil ph and nutrient analysis through their agricultural departments.