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Olk DC, Dinnes DL, Callaway CR. Maize Growth Responses to a Humic Product in Iowa Production Fields: An Extensive Approach. Front Plant Sci. 2022 Jan 10;12:778603. doi: 10.3389/fpls.2021.778603.
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A Metabolic Choreography of Maize Plants Treated with a Humic Substance-Based Biostimulant under Normal and Starved Conditions.

A New Standardized Method for Quantification of Humic and Fulvic Acids in Humic Ores and Commercial Products.
Lamar Method