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

Table 3

Converting hierarchy for assessing criterion to hierarchy for assessing SQ for the group of content of available forms of bioelements.

Parameter	Criterion (mg⋅kg^−1)	Hierarchy	Reference	Hierarchy for SQ ∈ [, ] (mg⋅kg^−1)	SQ
N bioavailable	>80	Rich		>80	Good
	20–80	Moderate	Le and Tran [12]	20–80	Moderate
	<20	Poor		<20	Poor
P bioavailable	>46	Rich		>46	Good
	36–46	Moderate	Nguyen [11]	36–46	Moderate
	<36	Poor		<36	Poor
K bioavailable	>150	Rich		>150	Good
	100–150	Moderate	Tran [10]	100–150	Moderate
	<100	Poor		<100	Poor