25 2.8.12 Sampling for soil moisture measurements With regard to the natural heterogeneity of soil structures and soil moisture regimes, usually large numbers of samples are necessary to obtain a representative estimation of the soil moisture storage in a given area of investigation, both in space and in time. As this may require considerable efforts and financial resources, it is important to establish an apropriate sampling programme, which takes into account ab bnumber of factors affecting the soil-moisture regime, such
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