A Simple Performance‐Based Index for Assessing Multiple Agroecosystem Functions

By M. Liebig, G. Varvel, J. Doran. 2001

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A comparison of soil quality indexing methods for vegetable production systems in Northern California (2002, background): “For many indicators, such as pH, P, and Zn, observations were scored as ‘higher is better’ up to a threshold value (e.g. pH 6.5) then scored as ‘lower is better’ above the threshold (Liebig et al., 2001).”
Soil quality index (SQI) as a tool to evaluate crop productivity in semi-arid Deccan plateau, India (2016, methodology): “Scoring of indicators Selected indicators in MDS were scored into dimension less values ranging from 0 to 1 using linear scoringmethod (Liebig et al., 2001).”
The Soil Management Assessment Framework (2004, unknown): “Carroll, 2001; Liebig et al., 2001; Andrews et al., 2002a, Although these indicators were not part of the MDSs, 2002b; Herrick et al., 2002).”
Past, present and future of soil quality indices : A biological perspective (2008, unknown): “One of such functions is the regulation of greenhouse effect gases by using indicators such as gas flow or C sequestration (Liebig et al., 2001).”