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The Twelve Soil Orders
This system for classifying soils is one of the most widely used soil classification systems in the world. Includes a collection of information and images to illustrate the distribution, properties, ecological significance, and use of these 12 soil orders.
soils.ag.uidaho.edu/

Putting Green Rootzone Soil Mixtures
Articles on permeability, drainage, and United States Golf Association Specification for Greens, by the Tifton Soil Laboratoy, Tifton, Georgia.
www.tiftonsoillab.com/

Soils and Soil Management
Offers a database and search function of a range of articles about fertilizers.
www.msue.msu.edu/

Under Ground Adventure
Soil biology, including a virtual tour of microorganisms.
www.fieldmuseum.org/

Iron Chlorosis
Explains how iron deficiency affects trees and plants, and how to correct it. Ohio State University fact sheet.
ohioline.osu.edu/

Preplant Soil Nitrate Tests
Description of tests that allow farmers to adjust nitrogen applications to meet the needs of each specific field.
www.cias.wisc.edu/

Understand your soil test: Sulfur
Background information on the role of sulphur in soil fertility, sulphur containing fertilizers and explanation of the results of a soil test.
ianrpubs.unl.edu/

Fytogreen Pacific - Water saving soil amendments
Fytofoam, an environmentally safe, biodegradable inert resin soil amendment with superior water absorption capacity, provides water saving of 50%, and healthier, better looking turf.
www.fytogreen.us/

Soil Quality Institute (SQI)
Research findings and practical technologies that help conserve and improve soil conditions. Applicable to farming, ranching, forestry and gardening.
soils.usda.gov/

Soil test interpretations
Gives examples of soil test values and explains their significance.
www.cahe.nmsu.edu/