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
Battery-Powered Meters
Test Factor |
Range* |
pH 5 |
pH 0-14 |
TDS 6 |
0-99.9 ppm;100-999 ppm;1.00-9.99 ppt |
*See tables below for unit conversion factors
Unit Conversion Factors
Results can be measured using a choice of units, explained here. Parts per million (ppm), pounds/acre, and Kg/hectare units can be converted to each other using these values:
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.
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