Properties and Distribution of Humic Substances and Inorganic Structure-Stabilizing Components in Particle-Size Fractions of Cultivated Mediterranean Soils

Characterization of Humic Carbon in Soil Aggregates in a Long‐term Experiment with Manure and Mineral Fertilization

“…Moreover, MA and MI fractions also showed the highest levels of O, N alkyl-C and anomeric-C. This trend, in accordance with the results reported by Tarchitzky et al, (2000), suggested that the HS composition of the MA fractions can preserve features very close to those of the plant residues. On the basis of these results, decomposition and humification mechanisms of organic matter seem to be related to different soil aggregate fractions.…”

Variation of organic carbon and nitrogen in aggregate size fractions of a paddy soil under fertilisation practices from Tai Lake Region, China

“…Low‐energy ultrasonic dispersion was used to obtain aggregate size fractions of the test soils. Bulk soil (50 g) was dispersed in distilled water (500 mL) using a tank disaggregator at ∼80 J mL −1 , following a procedure similar to that described by Tarchitzky et al 21 The > 2000 and 2000–250 µm fractions were obtained by wet sieving, while the < 2 µm fraction was obtained by centrifugation. The other fractions (250–20 and 20–2 µm) were obtained by sedimentation.…”

Soil structure and management: a review

“…The recalcitrance of humic substances (HS) is a result of their chemical resistance and their association with the soil matrix, which offers physical protection. Tarchitzky et al (2000) hypothesized that the distribution of HS, including fulvic acid (FA), humic acid (HA) and humin, in aggregates may reflect the initial coating of particles with HS than additional HS serving to bond particles together. The HAs can be adsorbed onto clay particles by polyvalent cations, making them especially effective in overcoming clay dispersion.…”