Applicability of multiple length TDR probes to measure water distributions in an Andisol under different tillage systems in Japan

Miyamoto, Teruhito; Kobayashi, Ryo; Annaka, Takeyuki; Chikushi, Jiro

doi:10.1016/s0167-1987(01)00172-6

Cited by 42 publications

(22 citation statements)

References 17 publications

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“…The applicability of the equation has been confirmed for Sand (Toyoura sand) 15 and Regosols (Masa) 18 . However, it is not appropriate for Andisols [11][12][13]17,19,21 . Hatano et al 13 compared water contents measured by the gravitational method and TDR for Gray-lowland soil, Brown forest soil and Gray-upland soil, and found that the Topp's equation was applicable as their calibration curve.…”

Section: Reviewmentioning

confidence: 99%

Time Domain Reflectometry Calibration for Typical Upland Soils in Kyushu, Japan

Miyamoto

Chikushi

2006

JARQ

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Time Domain Reflectometry (TDR) has recently become popular as a method to measure soil water content. An empirical Topp's equation and some dielectric mixing functions are often used as calibration curves of TDR. This review describes the Topp's equation and dielectric mixing models. In addition, applicability of Topp's equation and some dielectric mixing models for the θ-ε relationships for typical upland soils (two types of Ando soils, Red-yellow soils, two types of Brown forest soils, and Toyoura sand) are discussed. Following are several remarks that are stressed on TDR: (1) The empirical Topp's equation underestimates soil water content for mineral soils of low bulk density. (2) Since dielectric mixing models described the effect of bulk density on the calibration curve, they could be more suitable than the Topp's equation for the experimented soils. (3) Judging from the fitness of the whole curve, the third-order polynomial regressions and α model were superior to the Maxwell-De Loor model, which has no parameter to be identified. (4) The Maxwell-De Loor model was found to be so flexible that it reasonably fitted with measured data for different types of soil.

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Section: Reviewmentioning

confidence: 99%

Time Domain Reflectometry Calibration for Typical Upland Soils in Kyushu, Japan

Miyamoto

Chikushi

2006

JARQ

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“…Finally, although negligible in most mineral soils, the large surface area of volcanic soils (as high as 500 m 2 g À1 ), increases the contribution of rotationally hindered (bound) water to energy losses within the TDR frequency bandwidth (Or and Wraith, 1999). As a result, alternative TDR calibration curves for estimating u have been proposed for tropical volcanic soils (Weitz et al, 1997), and temperate volcanic soils from New Zealand (Tomer et al, 1999), Japan (Miyamoto et al, 2001), and Canary Islands .…”

Section: Introductionmentioning

confidence: 99%

TDR estimation of electrical conductivity and saline solute concentration in a volcanic soil

et al. 2005

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“…By applying this method to a field, the wetting front patterns in soil were determined 7 . It was also verified that the method is useful for measuring the soil water distribution under different tillage systems 3 . The objective of our study was to examine the effects of vegetation conditions on the distribution of the soil water content.…”

Section: Introductionmentioning

confidence: 82%

Spatial and Temporal Distribution of Soil Water Content in Fields under Different Vegetation Conditions Based on TDR Measurements

Miyamoto

Putiso

Shiono

et al. 2003

JARQ

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TDR (Time-domain reflectometry) is an advanced method for monitoring the water content in fields. TDR measurements can provide accurate information about vegetation effects on both spatial and temporal soil water distribution. The objective of this study was to examine the effects of vegetation conditions on the distribution of the soil water content. Soil water content was measured to express the spatial distribution in the surface layer (0-0.2 m) in grass, corn, and non-planted fields. Additionally, using the TDR method with multiple probes with different lengths, the measurements were conducted on a temporal basis at 4 depths (0-0.1, 0.1-0.2, 0.2-0.3 and 0.3-0.5 m) to determine the soil-water content profiles in the 3 fields. A significantly higher water content in both the grass and cornfields was found, compared to the non-planted field. Moreover, in the cornfield, we observed that microtopographic features significantly affected the spatial water distribution. The lower the soil water content, the higher the coefficient of variation of the soil moisture content. These results indicated that the effects of the vegetation conditions on the soil water distribution in the fields were significant. From the observation of the temporal soil water profiles in the 3 fields, it was found that soil management, i.e. tillage or no-tillage, was a major factor affecting the profiles.Discipline: Agricultural engineering Additional key words: electromagnetic wave, Andisol, multiple probes with different lengths JARQ 37 (4), 243 -248 (2003)

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Applicability of multiple length TDR probes to measure water distributions in an Andisol under different tillage systems in Japan

Cited by 42 publications

References 17 publications

Time Domain Reflectometry Calibration for Typical Upland Soils in Kyushu, Japan

Time Domain Reflectometry Calibration for Typical Upland Soils in Kyushu, Japan

TDR estimation of electrical conductivity and saline solute concentration in a volcanic soil

Spatial and Temporal Distribution of Soil Water Content in Fields under Different Vegetation Conditions Based on TDR Measurements

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