@inproceedings{PAR00003009, title = {{M}odelling bulk density according to structure development : toward an indicator of microstructure development in ferralsols}, author = {{B}ruand, {A}. and {B}albino, {L}.{C}. and {V}olland-{T}uduri, {N}. and {C}ousin, {I}. and {R}eatto {B}raga, {A}. and {L}opes de {O}liveira, {M}.{I}. and {D}e {S}ouza {M}artins, {E}. and {B}rossard, {M}ichel and {D}isnar, {J}.{R}.}, editor = {}, language = {{ENG}}, abstract = {{F}erralsols have a ferralic horizon at some depth between 30 and 200 cm that results from long and intense weathering. {T}heir clay fraction is usually mainly low-activity clay consisting of kaolinite with hematite, goethite and gibbsite in different proportions. {F}erralsols show little or no horizonation, and their macrostructure is absent to moderate. {O}n the other hand, they have typically a strong microstructure consisting of microaggregates < 1 mm in size. {B}ecause of the lack or small development of macrostructure, porosity of {F}erralsols is closely related to the development of microstructure and the assemblage of elementary particles within the microaggregates with a small contribution of large pores resulting from root development and macrofaunal activity. {T}heir physical properties are then closely related to the development of this microstructure. {H}owever, there is still no model in the literature that predicts changes of microstructure of these soils using easily accessible soil properties when land-use is modified. {T}he objective of this work was to relate microstructure development to the bulk density ({D}b) in {F}erralsols and then to make possible the use of {D}b as an indicator of microstructure development.}, keywords = {{BRESIL}}, numero = {}, pages = {141--142}, booktitle = {{F}rontiers of soil science : technology and the information age}, year = {2006}, URL = {https://www.documentation.ird.fr/hor/{PAR}00003009}, }