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Compost analysis provides a measure of the quantity of nutrients available to the plant.

Water soluble analysis offers growers and compost producers the chance to check levels of freshly made products.

Total nutrient analysis gives the grower an indication as to what is still left in the prills to release nutrients into the plants.

Air Filled Porosity (AFP) is a measure of the degree of aeration in a growing medium and is defined as that portion of the compost volume which contains air after saturation and drainage. Composts with higher AFP values are better drained, have a lower water holding capacity and are better oxygenated.

The preferred compost sample weight is 1 litre and must be accompanied by a field form.

• Mark all sample bags clearly with a reference number/name using a permanent marker.

• Carefully package the samples along with the corresponding completed field forms so that they arrive at the laboratory undamaged. Accompanying field forms are best protected by being placed in a clean sample bag.

• Do not use staples on either the field forms or bags for health and safety reasons.

• Boxes or bags which contain a number of soil samples should be labelled with a batch number to ensure prompt processing in the laboratory.

Compost sampling tips:

mound of compost

Compost Analysis

ICN Download the field form