Continuous no-till management of sloping cultivated
areas can promote soil property transformations, causing
changes in aggregation and dispersion. The objective of this work
was (i) to quantify the readily and mechanically dispersible clays
using different methods and (ii) to examine their relationships
with soil properties along a catena under no-till management.
For this study, the catena was divided into three distinct parts:
crest, upper-slope and mid-slope positions. Undisturbed soil cores
were sampled at each slope position to determine the following
soil properties: organic carbon, Ca2+, Mg2+, K+, Al3+, P, pH, cation
exchange capacity and total clay content. Additionally, the levels
of readily dispersible clay were measured using turbidimeter and
hydrometer methods, whereas mechanically dispersible clay was
quantified using the turbidimeter method. We observed high influence
of total clay content and organic carbon on soil flocculation;
P, Mg2+ and cation exchange capacity were positively related to
clay dispersion. Soil management and water transport downslope
are probably influencing changes in soil properties and determining
the distribution of dispersible clay contents along the catena.
No relationships were observed between readily dispersible clay
measured using turbidimeter and hydrometer in terms of quantity.
Hydrometer and turbidimeter measurements can deliver significantly
different results regarding dispersible clay quantification,
potentially leading to misinterpretations concerning the amount
of clay dispersed in water.
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