Additives

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Improve Your Garden Soil - Covers a wide range of garden soil topics, including soil types, pH, nutrients, testing, composting and fertilizers.
Do It Yourself.com: Fertilizer, Compost, and Soil - Series of projects, articles, and tips on fertilizing, composting, and nutrient management.
Gardening Information: Soil - Collection of articles from Oregon State University on various aspects of soil: use of amendments and cover crops, temperature, acidity, moisture, and testing.
Improving Soil - 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.
The Schundler Company - Collection of articles and resources about the horticultural uses of perlite and vermiculite.
Soil Testing is an Excellent Investment for Garden Plants and Commercial Crops, HYG-1132-99 - 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.
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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