Soil Testing

To measure the Nutrient or Ion content in a soil sample requires these ions to be extracted from the soil before any analysis can take place. This extraction needs to be simple, accurate and consistent to ensure the results are meaningful and representative. The method described is the 1 to 2 Volume method as developed by Cees de Kreij and as used by many of the analytical laboratories.

Once the sample has been prepared and a suitable time elapsed for the extraction to take place the sample can be tested.

This means that the EDT directION NPK Meter Sonde or any of our combination ISEs can be inserted directly into the sample. The stable ion concentration in ppm will be displayed directly in around 1 minute ready for the next test.

It is possible now to measure several ions in the same sample e.g. Nitrate, Potassium , Calcium and Phosphate.

If the test is to establish the amount of Nitrate Fertilizer to use in Kg /Hectare you will need to take many more samples of the field in an N or W pattern. If you wish to have this calculation please let us know.

The QP459 Ion Meter has two ion modes and will enable direct concentration analysis of around 20 different ions. To see how to calibrate the meter with a combination ISE click on the following link: QP459 Calibration.

See more videos from our YouTube Channel here.