The methods used for colorimetric and photometric involve an extraction process, creating a highly ionic solution. This in turn requires a slightly different formulation of colorimetric/photometric reagent than that used in water-based samples to provide effective colour development.
In summary, to measure soil parameters correctly requires the use of the soil reagents developed specifically for that purpose. We manufacture a range of soil test kits, with each specification offering a configuration designed for a different application, from simple measurement of key nutrients through to complete portable soil analysis laboratories.
We provide all the necessary parts and consumables within each kit, making it easy to select the kit you need to begin testing straight away. View each kit page on this website to see which reagents are included in each kit, and we also list the part codes of each component to aid procurement of additional and/or replacement consumables.
Palintest Soil Test Kits are designed to allow field testing of soil samples which should be comparable to standard laboratory methods.
All Palintest soil extraction methods are based on the method recommended in the UK by MAFF/ADAS ‘The Analysis of Agricultural Materials’ Reference book 427 where possible.
Test | Species | Palintest Extractant | MAFF/ADAS Extractions |
Nitrate | N | 1M Ammonium Chloride | 2M Potassium Chloride |
Phosphate | P | 0.5M Sodium Bicarbonate | 0.5M Sodium Bicarbonate |
Potassium | K | 0.1M Magnesium Acetate | 1M Ammonium Nitrate |
Calcium | Ca | 1M Potassium Chloride | 1M Ammonium Nitrate |
Magnesium | Mg | 1M Potassium Chloride | 1M Ammonium Nitrate |
Aluminium | Al | 1M Potassium Chloride | No method |
Ammonia | N | 1M Potassium Chloride | 2M Potassium Chloride |
Chloride | Cl | Water | Saturated Calcium Sulphate Solution |
Copper | Cu | 0.05M Disodium EDTA | 0.05M Ammonium EDTA |
Iron | FE | 1M Potassium Chloride | No method |
Manganese | Mn | 1M Ammonium Chloride | 1M Ammonium Acetate |
Conductivity | mS/cm | Water | Saturated Calcium Sulphate Solution |
Sulphate | S | Water | Water |
pH | pH | No extraction required | No extraction required |