Description
Clarkson 1988-03
SMART 3 Electronic Soil Lab Model SCL-15
Lamotte 1988-03
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The LaMotte Model SCL-15 is designed to provide the landowner, consultant, or fertilizer specialist with a method for achieving immediate and economical soil analyses in the field without sacrificing accuracy. The Model SCL-15 is a self-contained, electronic soil analysis laboratory that provides accurate answers anywhere for fifteen soil factors, including available forms of macronutrients and critical micronutrients. The SMART® 3 Colorimeter instantly analyzes color reactions developed in nutrient tests. Display readings are multiplied by a conversion factor specific to each test to provide a result in parts per million (ppm) or pounds per acre (lb/acre) no further calculations are necessary. The simplified test procedures provide at least 20 tests for each soil nutrient. Each accurately standardized system is furnished in an individual plastic module for quick distinction. All tests are performed in minutes on easy-to-prepare soil extracts, based on Mehlich I extraction. Includes A Study of Soil Science handbook now available as a download. |
Colorimeter Tests
| Test Factor | Method | Range |
# of Tests |
| Nitrate Nitrogen | Cadmium Reduction | 0-300 lbs/acre | 20 |
| Nitrite Nitrogen | Diazotization | 0-40 lbs/acre | 20 |
| Ammonia Nitrogen* | Nesslerization | 0-200 lbs/acre |
50 |
| Phosphorus | Ascorbic Acid Reduction | 0-99 lbs/acre | 50 |
| Potassium | Tetraphenyl-boron | 0-500 lbs/acre | 100 |
| Sulfur | Barium Chloride | 3-94 ppm | 50 |
| Copper | Diethyldi-thiocarbamate | 0-30 ppm | 100 |
| Iron | Bipyridal | 0-30 ppm | 50 |
| Manganese | Periodate | 0-75 ppm | 50 |
| Zinc | Zincon | 0-15 ppm | 50 |
*See tables below for unit conversion factors
Direct Reading Titrator Tests
| Test Factor | Range* |
# of Tests |
| Calcium | 0-4000 lbs/acre | 50 |
| Magnesium | 0-2400 lbs/acre | 50 |
| Chlorides | 0-1000 lbs/acre | 50 |
*See tables below for unit conversion factors
Unit Conversion Factors
| Area | Soil Depth |
Soil Weight |
| 1 acre | 6-7 inches |
2 million lb |
| 1 hectare | 15-18 cm |
2.25 million Kg |
| ppm | lb/acre |
Kg/hectare |
| 0.5 | 1 |
1.12 |
| 1 | 2 |
2.24 |
| 0.89 | 1.78 |
1 |
A number of variables must be considered when interpreting soil test results in addition to the values obtained. These variables
include the composition of the soil, drainage, climate, previous fertilizer programs, and the type of plant to be grown. Samples must
also be truly representative of the area being studied and must be carefully selected.
Additional Information
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