Fertilizers contain three main components: nitrogen, phosphorus and potassium. The fertilizer package lists their ratios in that order, such as 1-1-1 or 5-10-10.
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Michael Logan is a writer, editor and web page designer. His professional background includes electrical, computer and test engineering, real estate investment, network engineering and management, programming and remodeling company owner. Logan has been writing professionally since he was first published in "Test & Measurement World" in 1989.