content is given by the weight difference of the sample
before and after drying and is expressed in percentage by the
weight of the dry soil. As this method requires only simple
and cheap equipment (e.g. auger, balance, oven) and gives
direct results, it is the most widely used one and also the
one used to calibrate instruments in other methods.
One major disadvantage is the effort required to obtain the
necessary number of samples to yield significant moisture
averages in soils with big variations in composition and
texture or low absolute water content. The other is the fact
that, the sampling disturbs the soil which makes this method
unsuitable for continuous monitoring.
2.8.212 "Acetylene" method
This technique to measure the water-content of a fine orb bsandy soil sample is based on the principle that water will
react with calcium carbide to form acetylene gas and that the
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