Do It Yourself.com: Fertilizer, Compost, and Soil
- Series of projects, articles, and tips on fertilizing, composting, and nutrient management.
- http://www.doityourself.com/scat/fertilizercompostsoi

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.jsp?catref=C401

6 Functional Group Guide for Soil
- Microbiological components of a soil bioassay.
- http://www.bbclabs.com/six_soil.html

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

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

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/

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

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

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

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

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