Measurement Techniques for Water Flow

A review of the methods available for estimating soil moisture and its implications for water resource management

“…Attempts have been made by several workers to review soil moisture measuring techniques (Lunt et al, 2005;Robinson et al, 2008;Vereecken et al, 2008;Erlingsson et al, 2009;Pan et al, 2010) (Table S1). However, the earlier reviews do not compare the methods based on the inputs required, spatial coverage and accuracy of results obtained.…”

“…The biggest limitation of this technique is the dissolution and degradation of the gypsum block (International Atomic Energy Agency, 2008) and need for recalibration with time (Bulut and Leong, 2008). The gypsum block is affected by salt and temperature, resulting in errors (> ±0.01 ft 3 ft À3 ) in moisture estimation (Erlingsson et al, 2009). This method is unsuitable for sandy soils, where water drainage is fast (Zazueta and Xin, 1994).…”

“…The ambiguity in measurement of the automatic travel time of the instrument, restricted sphere of influence (about 1.6 in. ), sensitivity to air gaps, soil salinity, temperature, bulk density and clay content limit the use of this method (Evett, 2003;Erlingsson et al, 2009). …”

Crescimento, desenvolvimento e consumo hídrico de cana-de-açúcar sob dois sistemas de manejo da palha

“…A umidade do solo é determinada pelo conteúdo de água adsorvido nos espaços entre as partículas do solo (EVETT, 2003;ERLINGSSON et al,2009).…”