Colorimetric test methods are used for most test factors. Tests for calcium, sulfate and chlorides are based on turbidity measurements. Potassium analysis also employs a turbidity measurement, using a unique reading device to read directly in pounds per acre.
A single extraction procedure, using Morgan Universal Extraction Solution, provides the liquid soil extract for all the nutrient tests with the exception of chloride, which is extracted with demineralized water.
Each kit includes complete instructions, a soil management handbook and a pad of soil analysis report forms.
Four combination outfits are available in the STH series - STH-4, STH-5, STH-7 and STH-14, differing in the number of parameters tested.
| Model STH-4 | Model STH-5 |
Model STH-7 | Model STH-14 |
| pH pH 3.8-9.6 100 Tests |
pH pH 3.8-9.6 100 Tests |
pH pH 3.8-9.6 100 Tests |
pH pH 3.8-9.6 100 Tests |
| Nitrate Nitrogen 10-150 lbs/acre 50 Tests |
Nitrate Nitrogen 10-150 lbs/acre 50 Tests |
Nitrate Nitrogen 10-150 lbs/acre 50 Tests |
Nitrate Nitrogen 10-150 lbs/acre 50 Tests |
| Phosphorus** 10-200 lbs/acre 50 Tests |
Phosphorus** 10-200 lbs/acre 50 Tests |
Phosphorus** 10-200 lbs/acre 50 Tests |
Phosphorus** 10-200 lbs/acre 50 Tests |
| Potassium 100-400 lbs/acre 50 Tests |
Potassium 100-400 lbs/acre 50 Tests |
Potassium 100-400 lbs/acre 50 Tests |
Potassium 100-400 lbs/acre 50 Tests |
| Humus (Organic Matter) L-H 1.5%-8% 50 Tests |
Humus (Organic Matter) L-H 1.5%-8% 50 Tests |
Humus (Organic Matter) L-H 1.5%-8% 50 Tests |
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| Calcium 150-2800 ppm 50 Tests |
Calcium 150-2800 ppm 50 Tests |
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| Magnesium L-H 5-150 ppm 50 Tests |
Magnesium L-H 5-150 ppm 50 Tests |
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| Aluminum L-H 5-125 ppm 50 Tests |
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| Nitrite Nitrogen 1-50 ppm 50 Tests |
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| Sulfate 50-2000 ppm 50 Tests |
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| Chloride 25-500 ppm 50 Tests |
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| Ferric Iron 5-125 lbs/acre 50 Tests |
**For non-alkaline soils. Phosphorus Auxilliary package recommended for alkaline soils
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