1990
DOI: 10.1111/j.1365-2389.1990.tb00226.x
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The effects of fulvic and humic acids on soil aggregation: a micromorphological study

Abstract: SUMMARY The influence of soil amendment with fulvic + humic acid (FH) fractions, obtained from manure or peat, upon the shape, size and numerical density of aggregates in a sandy loam and a clay soil was examined using micromorphological techniques and image analysis. The effect of the FH fraction from manure (FHM) was to produce larger aggregates from the smaller ones, while the FH from peat (FHP) gave rise to a higher numerical density of smaller aggregates. Although the type of structural change was similar… Show more

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Cited by 31 publications
(16 citation statements)
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“…Our results agreed with Cheshire et al (1983), Metzger et al (1987), Lax and García-Orenes (1993) and, in part, with Albiach et al (2001). But some authors (Fortún et al, 1990;Piccolo and Mbagwu, 1990;Mbagwu and Piccolo, 1998;Spaccini et al, 2002) found that humic fractions of the organic matter were more important on aggregation than total organic carbon or carbohydrate content. Piccolo (1996) and Oades (1984) suggest that the role of carbohydrates in aggregate stability is regarded as transient.…”
Section: Relationships Between the Changes (D Biosolid-treated Minussupporting
confidence: 92%
“…Our results agreed with Cheshire et al (1983), Metzger et al (1987), Lax and García-Orenes (1993) and, in part, with Albiach et al (2001). But some authors (Fortún et al, 1990;Piccolo and Mbagwu, 1990;Mbagwu and Piccolo, 1998;Spaccini et al, 2002) found that humic fractions of the organic matter were more important on aggregation than total organic carbon or carbohydrate content. Piccolo (1996) and Oades (1984) suggest that the role of carbohydrates in aggregate stability is regarded as transient.…”
Section: Relationships Between the Changes (D Biosolid-treated Minussupporting
confidence: 92%
“…It is hypothesized that this might increase the resistance of aggregates to the disrupting effect of slaking (Caron, 1996). Although several laboratory studies have shown that the addition of humic substances (humic or fulvic acids or humin) improves aggregate stability through an increase in water repellence (Fortun et al ., 1990; Piccolo & Mbagwu, 1999), it is unclear whether water‐repellent substances per se affect aggregate stability in a field situation. We found that the increases in aggregation during incubation (Figure 4) only occurred with a concomitant increase in water repellence for the clay loam soil (soil 5).…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, Fortun et al (2006) stated that the improving flowering growth may be attributed to the increase in soil gatherings due to application of nitrogen fertilizer. The composition of these aggregates could protect zinnia plants to be enclosed under soil at all growth stages, and this could improve flower quality.…”
Section: And Discussionmentioning
confidence: 99%