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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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Colorado PlanTalk: Iron Chlorosis - http://www.ext.colostate.edu/ptlk/2115.html
Explains how iron deficiency affects trees and plants, with links to more detailed information.
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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.
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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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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.
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Gardening Information: Soil - http://extension.oregonstate.edu/news/category_search.php?searchCat=soil
Collection of articles from Oregon State University on various aspects of soil: use of amendments and cover crops, temperature, acidity, moisture, and testing.
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6 Functional Group Guide for Soil - http://www.bbclabs.com/english/sixfg_soil_guide.html
Microbiological components of a soil bioassay.
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The World of Soil - http://soil.hostweb.org.uk/
An introduction to soil components, acidity, fertility, and care, as well as a collection of links to other soil resources.
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