Marble powder is one of carbonate rock amendments
that is used to improve soil reaction. We hypothesized
that the powdered marble addition can cause favorable changes
in hydraulic properties of sandy soils. Six levels of marble powder
addition to an aridisol soil (0%; M0; 5%; M5; 10%; M10;
15%; M15; 20%; M20 and 25%, M25; by bulk volume) were analyzed
in triplicate. The saturated hydraulic conductivity and soil
water retention curves were obtained. Pore space properties were
investigated using soil water retention curves, mercury intrusion
porosimetry and scanning electron microscopy. The saturated
hydraulic conductivity significantly decreased (between 83 and
97% for M5 and M25 respectively) and parameters α and n of the
van Genuchten model significantly decreased in marble-amended
soils. Both field capacity and permanent wilting point increased
with the addition of marble powder. Plant-available water,
increased significantly until 10% of marble powder application;
higher percentages of application did not provide additional
significant changes in the plant-available water. Pore space distributions
from soil water retention curves parameters showed an
increase in the pore size range and a decrease in the average pore
size; pore space distribution from the scanning electron microscopy
also showed the presence of a new family of dominant pore
sizes which was not detected by the soil water retention curves
parameters approach. It was concluded that the addition of marble
powder can improve the ability of soil to store water providing
an advantage for irrigation water management in water scarce
environments. Further research will have to address the impact
of marble powder amendment under field semi-arid conditions.
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