Kvalita půdy

Oblast zaměření: Kvalita půdy
Komise : CEN/TC 444 (Environmental characterization)
Původce: CEN
K připomínkám do: 7.05.2018
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This document specifies laboratory methods for determination of the soil water-retention characteristic.

This International Standard applies only to measurements of the drying or desorption curve.

Four methods are described to cover the complete range of soil water pressures as follows:

a)     method using sand, kaolin or ceramic suction tables for determination of matric pressures from 0 kPa to −50 kPa;

b)    method using a porous plate and burette apparatus for determination of matric pressures from 0 kPa to −20 kPa;

c)     method using a pressurized gas and a pressure plate extractor for determination of matric pressures from −5 kPa to −1 500 kPa;

d)    method using a pressurized gas and pressure membrane cells for determination of matric pressures from −33 kPa to −1 500 kPa.

Guidelines are given to select the most suitable method in a particular case.