What are soil analysis extraction methods and why is it needed?

The extraction method is the analytical procedure used to determine the level of a certain nutrient in the soil.

 

Extraction method and unit are required to interpret and classify the added nutrient values. If your originally selected extraction method for a certain nutrient is currently not available in Atfarm, you will be informed with a red marked hint in the analysis page. Then please choose another extraction method.

 

These are common extraction methods:

 

Nutrient 

Unit 

Method 

pH 

-

Water 

Phosphorous 

mg/100g 

CAL 

Phosphorous 

ppm 

Olsen 

Potassium 

ppm 

1M Ammonium Nitrate 

Nitrogen 

Dumas Combustion 

Magnesium 

mg/100g 

CaCl2 

Magnesium 

mg ppm 

1M Ammonium Nitrate 

Calcium 

Ca ppm 

1M Ammonium Nitrate 

 

We may add more methods and interpretation calculations in the future.

 

If you do not know the extraction method or unit, please contact your lab provider.

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