Building Fertile Soil

Guide to creating and maintaining good quality soil, emphasizing organic materials and composting, from the Center for Agroecology and Sustainable Food Systems.
http://zzyx.ucsc.edu/casfs/gardenideas/soilfert.html

Improving Soil

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.
http://www.rodsgarden.50megs.com/improvingsoil.htm

Better Homes and Gardens: Soil, Water & Fertilizers

Includes articles on making potting mixes, proper watering techniques, nutrient needs, and mulching.
http://www.bhg.com/bhg/category.jhtml?catref=C401

Iron Chlorosis

Explains how iron deficiency affects trees and plants, and how to correct it. Ohio State University fact sheet.
http://ohioline.osu.edu/hyg-fact/1000/1009.html

Lead Contamination In The Garden

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.
http://ohioline.osu.edu/hyg-fact/1000/1149.html

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.
http://ohioline.osu.edu/hyg-fact/1000/1132.html

Improving Soils For Vegetable Gardening

Ohio State University fact sheet covers soil basics: types, texture and structure, drainage and moisture, nutrients, pH, and cover crops.
http://ohioline.osu.edu/hyg-fact/1000/1602.html

Vermiculite.com

One-page site giving suggestions on where to purchase vermiculite in the United States, along with some uses and properties of vermiculite.
http://www.vermiculite.com

Improve Your Garden Soil

Covers a wide range of garden soil topics, including soil types, pH, nutrients, testing, composting and fertilizers.
http://www.improve-your-garden-soil.com/

The Schundler Company

Collection of articles and resources about the horticultural uses of perlite and vermiculite.
http://www.schundler.com/hort.htm

The World of Soil

An introduction to soil components, acidity, fertility, and care, as well as an extensive collection of links to other soil resources.
http://web.ukonline.co.uk/fred.moor/soil/

A Summary Guide For The Microbiological Analysis of Soil and Compost

Informational sheet.
http://www.bbclabs.com/function.htm

Do It Yourself.com: Fertilizer, Compost, and Soil

Series of projects, articles, and tips on fertilizing, composting, and nutrient management.
http://doityourself.com/fertilizer/

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.
http://extension.oregonstate.edu/news/category_search.php?searchCat=soil