Aggregate Indices Method in Soil Quality Evaluation Using the Relative Soil Quality Index

Table 4

Converting hierarchy for assessing criterion to hierarchy for assessing SQ for heavy metals (mg⋅kg⁻¹, top soil).

Parameter	Land for agricultural purpose, reference; (QCVN 03:2008/BTNMT) [9]	Hierarchy for SQ	SQ
(1) Cadmium (Cd)		<2	Good
	2	=2	Moderate
		>2	Poor
(2) Copper (Cu)		<50	Good
	50	=50	Moderate
		>50	Poor
(3) Lead (Pb)		<70	Good
	70	=70	Moderate
		>70	Poor