1997
DOI: 10.1590/s0103-90161997000300003
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Abstract: A neutron probe calibration correction is proposed in order to reduce soil water content variability, assumed to be a consequence of improper calibrations relations. The time stability of spatially measured soil water content data is used to correct the intercepts of linear calibration relations. This procedure reduced the coefficients of variation of soil water content data from 4 to less than 2% in a Rhodic Kanhapludalf.

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Cited by 19 publications
(8 citation statements)
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“…Slow neutron counting data were transformed into soil water contents using calibration curves established as suggested by Reichardt et al (1997), taken as valid over all depths. Soil water storages at times j and positions i, S j (i) (mm) for the 0-1.0 m soil layer were calculated from q t, x (k) data by the trapezoidal rule: S j ðiÞ ¼½1:5q i; j ð1Þ þ q i; j ð2Þ þ q i; j ð3Þ þ q i; j ð4Þ þ 0:5q i; j ð5Þ 1000 5…”
Section: Methodsmentioning
confidence: 99%
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“…Slow neutron counting data were transformed into soil water contents using calibration curves established as suggested by Reichardt et al (1997), taken as valid over all depths. Soil water storages at times j and positions i, S j (i) (mm) for the 0-1.0 m soil layer were calculated from q t, x (k) data by the trapezoidal rule: S j ðiÞ ¼½1:5q i; j ð1Þ þ q i; j ð2Þ þ q i; j ð3Þ þ q i; j ð4Þ þ 0:5q i; j ð5Þ 1000 5…”
Section: Methodsmentioning
confidence: 99%
“…Kachanoski and De Jong (1988) and Moreti et al (2007) also used this concept to show the temporal persistence of spatial patterns of S. Reichardt et al (1997) suggested that part of the time stability of soil water content measurements is due to systematic errors introduced by soil water content calibration curves when indirect methods of measurement are employed, such as neutron probes, time domain reflectrometry (TDR), and frequency domain reflectrometry (FDR). Hu et al (2008) verified the time stability of soil water content measurements made using FDR at the soil surface layer of a hill-slope of the Loess Plateau in China, and found significant correlations with several factors influencing landscape.…”
Section: Introductionmentioning
confidence: 99%
“…Measurements of mean volumetric water content throughout the entire period were used to fit the model to observed data. Soil water content was measured using Neutron Probes (CNC503B, China; Reichardt et al 1997;Tominaga et al 2002;Chen & Shao 2003). Before the start of the experiment, 27 aluminum tubes of 4.5 cm in diameter and 6.3 m long (three sampling plots in every stand, three tubes in each plot) were installed vertically in the mineral soil after removal of the O-horizon (if present).…”
Section: Field Measurementsmentioning
confidence: 99%
“…Four measurements were performed per week. The calibration of the neutron probe was made by comparing the gravimetric measurements made during implementation of the access tubes and neutron counts measured by the probe (Reichardt et al, 1997). For every layer, a calibration curve was prepared using:…”
Section: Neutron Moisture Probementioning
confidence: 99%