Which if the following is true about a soil quality index (SQI)?
A) Soil quality indices may be used to monitor the effects of changes in soil management practice over time.
B) The SQI must be related to a particular functional goal for the soil in the ecosystem.
C) Soil pH, bulk density (Mg m-3 ) and soil active C levels (mg kg-1 ) may all be averaged together in a SQI.
D) All of the above are true.
E) None of the above is true.
D
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