There are six simple steps to core sampling:

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Take at least ten core samples from the area you are interested in. These should be taken randomly over the area, spreading the sampling widely.

Note that the type of core sampler used to test for soil nutrient levels is much smaller than the sampler used for checking thatch, mat and soil compaction. These smaller diameter samplers are also limited to taking samples from the top 100 mm, as this is where most of the nutrients should be. Using a smaller diameter core sampler also allows multiple sampling without disturbing the playing surface.

The core sample needs to be deep enough to penetrate down to clean soil. This will ensure that the corer has reached below the thatch and mat layers.

Measure the sample from the surface of the grass to the start of the clean soil with a ruler or measuring tape. Record this figure on your record sheet.

Once you have recorded the data required, immediately replace the sample. There is no need for it to be out of the ground for longer than necessary as it may dry out.

Make sure that the sample matches the existing turf surface level. Too high and the area will be scalped when it is next mown, too low and it will disrupt the playing surface.

Once all samples have been taken, make sure to wash down the sampling equipment to remove any soil, bacteria or fungi. This is to avoid transfer to future samples.

Collate all measurements taken and calculate the average depth of the thatch and mat layers. Date and file this information for future reference.