- Building Fertile Soil - http://zzyx.ucsc.edu/casfs/gardenideas/soilfert.html
Guide to creating and maintaining good quality soil, emphasizing organic materials and composting, from the Center for Agroecology and Sustainable Food Systems.
- Iron Chlorosis - http://ohioline.osu.edu/hyg-fact/1000/1009.html
Explains how iron deficiency affects trees and plants, and how to correct it. Ohio State University fact sheet.
- Lead Contamination In The Garden - http://ohioline.osu.edu/hyg-fact/1000/1149.html
Covers causes and effects of elevated lead levels, recommends both health and soil screening procedures, and provides guidelines for gardening in areas with lead contamination.
- 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.
- 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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