An example of why soil sampling is a difficult in biological systems. I have had the same field sampled and tested for CO2 burst now 3 years in a row with 3 differing results
2021 was very encouraging with the CO2 burst being off the scale 239mg CO2/kg soil
2022 was slightly underwhelming with it being back to 109
2023 was back up to 195
In '22 I put it down to 2 things, the weather even though it was sampled in July it was a particularly colder damper spell of weather and also I had used slightly more N fertiliser that year to try and get a bit more grass.
'23 This field got zero N but it was later sampled
Also you will see a fair variation in pH and carbon figures. These along with CO2 burst could also be human error at sampling or in the lab.
The classic problem with biological systems is the amount of variation because of the complex nature of many competing factors. This is why data can be very misleading. But two options to turn data into more meaningful information is within a trial to monitor trends over time or in the case of research undertake numerous replicates.