Reported outliers by LiaB

There are 5 possible reasons why an outlier would appear:

1. High mineral content in the soil: peat soils, ashes in the soil, volcanic soil (soil type dependent),
2. Depth of soil sample is higher than 30cm,
3. Very sandy soils (beach sand),
4. Soil collected in a forest area (high content of organic matter)
5. Sample preparation, main issue would be if the soil was slightly moist, not properly dried.

What to do about it?

1. Repeat sample preparation, dry the soil again at 40 degrees Celsius, grind and mill. Make sure the soil is completely dried.
2. Check soil origin, where was the soil collected? For instance, soil from uncalibrated areas or volcanic areas can be an issue.
3. Check the management practices in the farm, has there been recent manure/compost/lime/fertilizer applications?