Improving Soil -- http://www.rodsgarden.50megs.com/improvingsoil.htm
Origon horticulturalist offers information on soil components, pH, testing methods, and nutrients, and means of improving it by using amendments and improving drainage and aeration.
Improving Soils For Vegetable Gardening -- http://ohioline.osu.edu/hyg-fact/1000/1602.html
Ohio State University fact sheet covers soil basics: types, texture and structure, drainage and moisture, nutrients, pH, and cover crops.
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.
Improve Your Garden Soil -- http://www.improve-your-garden-soil.com/
Covers a wide range of garden soil topics, including soil types, pH, nutrients, testing, composting and fertilizers.
The World of Soil -- http://web.ukonline.co.uk/fred.moor/soil/
An introduction to soil components, acidity, fertility, and care, as well as an extensive collection of links to other soil resources.
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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