Assertion: soil | /r/HasProperty | analyzed in a soil testing laboratory
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text: Several methods that are commonly used in the field to evaluate soil health are: a) a penetrometer to measure the compaction of the soil at different soil depths, b) digging a spade full of soil and examining the structure and texture of the soil as well as the roots and other organic matter present in the soil, c) using a soil core probe that takes a profile of the soil that can be analyzed in a soil testing laboratory, and d) a rain simulation sprinkler steadily raining on a measured sample contained in a sieve below and the soil that is not washed away is used to compute the aggregate stability of the soil.