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• Science: Agriculture: Soils  (315)
• Shopping: Home and Garden: Fertilizers and Soil Additives  (83)

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• Improve Your Garden Soil   - Covers a wide range of garden soil topics, including soil types, pH, nutrients, testing, composting and fertilizers.

  Colorado PlanTalk: Iron Chlorosis - Explains how iron deficiency affects trees and plants, with links to more detailed information..

  Do It Yourself.com: Fertilizer, Compost, and Soil - Series of projects, articles, and tips on fertilizing, composting, and nutrient management..

  6 Functional Group Guide for Soil - Microbiological components of a soil bioassay..

  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..

  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..

  The Schundler Company - Collection of articles and resources about the horticultural uses of perlite and vermiculite..

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

  The World of Soil - An introduction to soil components, acidity, fertility, and care, as well as a collection of links to other soil resources..

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