Biological Activities of Humic Substances

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A combination of humic substances and Herbaspirillum seropedicae inoculation enhances the growth of maize (Zea mays L.) (2013, methodology): “Humic substances may promote plant growth through the induction of carbon and nitrogen metabolism (Nardi et al. 2009).”
Humic substances from vermicompost enhance urban lettuce production (2014, unknown): “Nardi et al. (2009) reported that humic substances may inhibit the activity of glucokinase, phosphoglucose isomerase, aldolase, and pyruvate kinase (enzymes that are involved in glucose metabolism) and demonstrated that the effect of humic sub-stances on the activities of enzymes related to the…”
Agricultural uses of plant biostimulants (2014, background): “Another commonly cited difference between humic and fulvic acids is that humic acids are typically high-molecular-weight, while fulvic acids are low-molecular-weight (Nardi et al. 2009).”
Probing the hormonal activity of fractionated molecular humic components in tomato auxin mutants (2011, unknown): “Direct effects of humic substances on plant root growth have been long recognised (Nardi et al., 2009), but the mechanism by which humic substances stimulate plant biological activities remains unresolved.”