1987
DOI: 10.1007/bf00256983
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Hormone-like effect and enhanced nitrate uptake induced by depolycondensed humic fractions obtained from Allolobophora rosea and A. caliginosa faeces

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Cited by 69 publications
(31 citation statements)
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“…The supporters of this theory reported that the 280 nm absorption of humic acids (HA) was reversibly shifted from high to low molecular size ranges when organic acids (for example acetic acid) were added to lower the pH of a humic solution from 9.2 to 2 before the elution in a 0.02 mol liter − 1 alkaline borate buffer (Dell ' Agnola and Nardi, 1987 ;Piccolo et al, 1996a,b ). To explain their results, they suggested that, instead of being stable polymers, HS at neutral or alkaline pH values are supramolecular associations of relatively small heterogeneous molecules held together by weak dispersive forces.…”
Section: An Overview On Definitions Features Properties and Functimentioning
confidence: 99%
“…The supporters of this theory reported that the 280 nm absorption of humic acids (HA) was reversibly shifted from high to low molecular size ranges when organic acids (for example acetic acid) were added to lower the pH of a humic solution from 9.2 to 2 before the elution in a 0.02 mol liter − 1 alkaline borate buffer (Dell ' Agnola and Nardi, 1987 ;Piccolo et al, 1996a,b ). To explain their results, they suggested that, instead of being stable polymers, HS at neutral or alkaline pH values are supramolecular associations of relatively small heterogeneous molecules held together by weak dispersive forces.…”
Section: An Overview On Definitions Features Properties and Functimentioning
confidence: 99%
“…vitamins, plant hormones, enzymes and amino acids) have been detected in earthworm extracts (e^. Gavrilov, 1962;Nielson, 1965;Graff & Makeschin, 1980;Dell'Agnola & Nardi, 1987). Earthworms have been found to stimulate soil enzymes, such as glucosidase and phosphatase (possibly of microbial origin) which influence availability of plant nutrients (e^.…”
Section: Plant Growth Factorsmentioning
confidence: 99%
“…La moderna scienza del suolo sta studiando proprio questi aspetti. Si citano alcuni tra i tanti lavori sul funzionamento del suolo e sulle forme di humus, per coloro che avessero voglia di approfondire: Dell'Agola e Nardi, 1987;Piccolo, 1996Piccolo, , 2001Piccolo et al, 2004;Nicolai, 1988;Wolters, 2000;Six et al, 2002;Godefroid et al, 2005;Lutzow et al, 2006;Graefe, 2007;Andreetta et al, 2013;Ponge et al, 2011Berg e McClaugherty, 2014;Berg, 2014). Figura 1.…”
Section: Conclusioniunclassified