FAQs

Hand operated soil probes are pushed or pounded rather than twisted into the ground. These probes produce soil cores rather than a loose sample. An auger is twisted into the ground and produces a loose soil sample. You can also use a soil auger to clear the top layer of soil away before using a soil probe to sample at greater depths.

Augers can be used for sampling when there is not a need for a clean or undisturbed sample. They work best in hard or rough conditions. Generally, augers are used to bore to a depth where a sample is to be obtained using a soil sampler. Usually the auger is used in these cases to bore to greater depths than using a soil sampler allows, or when the soil is hard or rough and needs to be loosened up. When you require the collection of a virtually undisturbed sample, a soil probe should be used. You can use an auger to bore to the required depth to take the sample.

Soil samples can be taken any time throughout the year for checking pH, phosphorus and potassium status. It is recommended to collect soil samples at least one to two months before planting or during the dormant season to allow time for lime recommended to react with the soil and change the pH before the crop is planted. It is not recommended to sample immediately after lime, fertilizer, or manure is applied to the soil. Wait 6-8 weeks after those applications to sample so you can obtain true soil fertility. To assess soil nitrogen, sample as close to planting as possible.

Annually test fields to measure the available nitrogen pool or as often as needed to understand how soil properties may be changing in relation to different practices and crop production. Test soil if fertilizer is going to be applied or when problems occur during the growing season.

20 samples taken randomly from the area of interest are recommended to obtain a sample which will represent an average of the soil in the field or area.