Testing Your Soil - How to Collect and Send Samples PDF (251,000 bytes)
Soil Submittal Form for Texas A&M Lab PDF (48,000 bytes)
Soil Fertility Book
Soil Taxonomy Information (9.9 megs -- 871 pages)
Learning More About Soil from Dr. Dirt
Basics Soil Science and Soil Fertility
USDA -- Soil Education
Nutrient Content of Fertilizer Materials
Fertilizer Requirements of Selected Vegetable Crops
Nutrient Calculator
Soil Horizons
Back to Basics: The Roles of N, P, K and Their Sources
Soil Fertility Recommendations for Various Crops and Land Uses
Plant Nutrition and Soil Fertility
Web Soil Survey
NRCS Soil Information
Improving Garden Soil Fertility -- Oklahoma Cooperative Extension Service