Improve Your Garden Soil*Cool Site* - Covers a wide range of garden soil topics, including soil types, pH, nutrients, testing, composting and fertilizers.
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.
Vermiculite.com - One-page site giving suggestions on where to purchase vermiculite in the United States, along with some uses and properties of vermiculite.
Last update: 5:24 PT, Saturday, August 16, 2008
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