Guidelines for soil samplingTake a representative sample!!!
Check the area to be sampled for notable features (e.g. slope, soil types, vegetation, drainage).
Draw a sketch map, and identify and mark the location of sampling sites.
Take soil samples with a soil auger at the sampling depth (0-20 cm or 20-40 cm).
Take 10-35 sub-samples per site, the number depending on the size and heterogeneity of the field.
Combine the sub-samples to one composite per site and mix thoroughly.
If necessary, reduce sample weight by sub-dividing
Label the sample of soil properly.
Air-dry the sample and when dry, store it, properly labelled, in a plastic bag or a glass bottle for further analyses.