See also: Compost • Mulch • Fertilizers
Do It Yourself.com: Fertilizer, Compost, and Soil
doityourself.com
Series of projects, articles, and tips on fertilizing, composting, and nutrient management.
Gardening Information: Soil
extension.oregonstate.edu
Collection of articles from Oregon State University on various aspects of soil: use of amendments and cover crops, temperature, acidity, moisture, and testing.
Better Homes and Gardens: Soil, Water & Fertilizers
bhg.com
Includes articles on making potting mixes, proper watering techniques, nutrient needs, and mulching.
Improving Soil
rodsgarden.50megs.com
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.
Iron Chlorosis
ohioline.osu.edu
Explains how iron deficiency affects trees and plants, and how to correct it. Ohio State University fact sheet.
The Schundler Company
schundler.com
Collection of articles and resources about the horticultural uses of perlite and vermiculite.
A Summary Guide For The Microbiological Analysis of Soil and Compost
bbclabs.com
Informational sheet.
Vermiculite.com
vermiculite.com
One-page site giving suggestions on where to purchase vermiculite in the United States, along with some uses and properties of vermiculite.
Soil Testing is an Excellent Investment for Garden Plants and Commercial Crops, HYG-1132-99
ohioline.osu.edu
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.
Lead Contamination In The Garden
ohioline.osu.edu
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
ohioline.osu.edu
Ohio State University fact sheet covers soil basics: types, texture and structure, drainage and moisture, nutrients, pH, and cover crops.
Improve Your Garden Soil
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
web.ukonline.co.uk
An introduction to soil components, acidity, fertility, and care, as well as an extensive collection of links to other soil resources.