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| Interpreting
Soil & Plant Tissue Tests by Marr Waddoups, Agronomist COPYRIGHT 1971-1996, MARR WADDOUPS Table of Contents |
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| Topic | Page Number |
| Introduction | Page 3 |
| General Properties of Soil | Page 4 |
| Interactions Between Root, Colloid, Soil Solution, Air, Plant Residue, and Mineral Reserves for Plant Nutrition | Chart |
| Organic Matter | Page 6 |
| Principle of Using Soil Test Values to Make Fertilizer Recommendations | Page 6 |
| Nitrogen: | Page 8 |
| The Process of Nitrification | |
| Estimating Nitrogen Needs | Page 9 |
| Plant Residues | |
| Nitrogen Carry Over | |
| Nitrogen and Irrigation | |
| Nitrogen Application | Pages 10-11 |
| Recommended Rates of Nitrogen | |
| Suggestions for Using Nitrogen Charts | Pages 11-12 |
| Nitrogen Recommendation Charts | Nitrogen Chart List |
| Phosphorus | Pages 28-29 |
| Phosphorus Recommendations | Phosphorous Chart List |
| Sulfur | Page 32 |
| Sulfur Recommendations | Sulfur Chart |
| Cation Exchange Capacity | Pages 34-35 |
| Determing the Soil Need for Cations | |
| Recommending Applications of Cations | Page 36 |
| Potassium, Calcium, and Magnesium | |
| Potassium Recommendations | Chart List |
| Soil Micronutrients | Pages 40-41 |
| Using Trace Element Anaylses | |
| Micronutrient Rating Schedule | Page 41 |
| Fertilizing With Micronutrients | Page 42 |
| Boron Recommendations | Chart |
| Zinc Recommendations | Chart |
| Micronutrient Materials | Page 45 |
| Soil Mositure and Fertility Logging | Page 46 |
| Example: Logging for Sugar Beets | Chart |
| Example: Logging for Potatoes | Chart |
| Timing and Application Methods for Soil Fertility Materials | Page 49 |
| Fertilizer Application In Irrigation Water | Page 50 |
| Factors Affecting Irregularities In Analyses | Page 51 |
| Procedure for Taking Soil Samples | Page 52 |
| General Recommendations | |
| Sampling for Variability Grid Test | |
| Example of Grid Sampling | Chart |
| Sampling for Full Profile Tests | Page 54 |
| Sampling for Micronutrient Anaylses | |
| Sampling for Nitrate and Ammonia Nitrogen | |
| Special Soil Problems | Pages 55-56 |
| Low pH | |
| High Salt Concentrations | |
| Toxicity | Page 56 |
| Plant Tissue Analyses | Page 57 |
| Tissue Analyses Values-Field Crops | Table |
| Tissue Analyses Values-Fruit Crops | Table |
| Appendix | |
| Principal Fertilizer Materials | Table |
| Approximate Pounds per Acre of Nutrients Removed by Various Crops | Table |
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