Soil texture is an
important input parameter for many soil hydraulic pedotransfer functions (PTFs)
of the day. Common soil particle-size classes are required to be able to
uniformly determine the texture of soils. However, it is not always possible -
due to different national classification systems - and much valuable
information is disregarded while either deriving or applying PTFs.
to get common particle-size class information is to interpolate the
particle-size distribution (PSD) curve. Advanced interpolation solutions are
becoming available, but there is always uncertainty associated with these
techniques. Another possibility is to measure all PSD curves in such a way that
it is compatible to the commonly used classification systems.
A new automated measurement
technique is introduced that can easily provide PSD data compatible to any (and
all) of the existing national and international classification systems at the
same time, without the burden of extra labour. A computerized measurement
system has been developed to record density changes in a settling-tube system
in any discretional (small) time steps, which in turn allows the derivation of
a quasi-continuous PSD curve. The measurement is based on areometry
(Stokes-law), thus the system is compatible to the most commonly applied
settling-tube measurements. The new evaluation method of measured values takes
into consideration the density changes along the areometer-body so it avoids
the problem of reference point determination. The theory and setup of the
system are explained and measurement examples are given. The presented
comparative measurements show good correspondence with conventional
settling-tube results, and the reproducibility of the measurement shows to be
very high. This technique does not require more sample preparation than past
methods. The automated reading requires less manpower to perform the
measurement - which also reduces human error sources. However, it provides very
detailed PSD data that has advantages, like revealing multi-modality in the
particle-size distribution or providing data that complies with any of the
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Agrokémia és Talajtan
2021 Volume 70
Magyar Tudományos Akadémia
H-1051 Budapest, Hungary, Széchenyi István tér 9.
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.