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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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Fertilization of Lawns - http://ohioline.osu.edu/hyg-fact/4000/4006.html
Details the benefits of and how to fertilize lawns. |
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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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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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Responsible Fertilizer Practices for Lawns - http://www.extension.umn.edu/distribution/horticulture/DG6551.html
Outlines general fertilizer practices, nitrogen and phosphorus requirements, and application timing for lawns. |