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Washington State Department of Agriculture - http://agr.wa.gov/
Information on products and their content of heavy metals, along with fertilizer laws and label requirements. |
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Lawn Talk - http://www.urbanext.uiuc.edu/lawntalk/lawntalk10.html
A range of lawn fertilizing articles beginning with "Choosing Fertilizers for Home Lawns". |
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Fertilizing Landscape Plants - http://ohioline.osu.edu/hyg-fact/1000/1002.html
Explains the necessities of fertilizing plants. |
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Extremely Green Gardening Company - http://www.extremelygreen.com
Online source for organic gardening products including fertilizers, biological pest control, soil test kits. |
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Soils and Soil Management - http://web1.msue.msu.edu/msue/imp/modf1/masterf1.html
Offers a database and search function of a range of articles about fertilizers. |