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Soil Testing is an Excellent Investment for Garden Plants and Commercial Crops, HYG-1132-99 - http://ohioline.osu.edu/hyg-fact/1000/1132.html
Ohio State University fact sheet covers the benefits of testing garden soil and provides recommendations for testing frequency, collecting a sample, and submitting to a testing lab. |
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The Schundler Company - http://www.schundler.com/hort.htm
Collection of articles and resources about the horticultural uses of perlite and vermiculite. |
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Vermiculite.com - http://www.vermiculite.com
One-page site giving suggestions on where to purchase vermiculite in the United States, along with some uses and properties of vermiculite. |
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Improving Soil - http://www.rodsgarden.50megs.com/improvingsoil.htm
Oregon horticulturalist offers information on soil components, pH, testing methods, and nutrients, and means of improving it by using amendments and improving drainage and aeration. |
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Do It Yourself.com: Fertilizer, Compost, and Soil - http://www.doityourself.com/scat/fertilizercompostsoi
Series of projects, articles, and tips on fertilizing, composting, and nutrient management. |