+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Using time-domain reflectometry to measure soil water in Hawaiian sugarcane

Using time-domain reflectometry to measure soil water in Hawaiian sugarcane

Agronomy Journal 82(1): 144-146

Time-domain reflectometry (TDR) has been suggested as a convenient technique for quantifying soil water in agronomic experiments. Sampling protocols and installation techniques remain to be described and the validity of a "universal" calibration equation remains to be tested in Fe-rich volcanic soils. Thus, TDR was evaluated in this study for measurement of volumetric soil-water content in an extensive sugarcane field in Hawaii. Matched pairs of probes, 0.359 m and 0.725 m long, were installed vertically at various distances from the drip irrigation line at six locations in a well-watered field. This sampling protocol resolved the diurnal depletion of soil water due to evapotranspiration and the decline in soil water with distance from the drip irrigation line, both occurring largely within the surface 0.36 m of soil. Independent measurements of soil-water content using gravimetric methods confirmed the accuracy of the TDR determinations and validated a universal calibration for Fe-rich Hawaiian soils. A rapid technique was developed to install probes, which remained functional throughout the 2-yr crop cycle. Use of spaced arrays of TDR probes is safer, more convenient, and more suited to automation of data acquisition, reduction, and analysis, than conventional methods of assessing volumetric water content.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 001997969

Download citation: RISBibTeXText

DOI: 10.2134/agronj1990.00021962008200010031x

Related references

Comparing heat-pulse and time domain reflectometry soil water contents from thermo-time domain reflectometry probes. Vadose zone journal VZJ 4(4), 2005

Comparing heat-pulse and time domain reflectometry soil water contents from thermo-time domain reflectrometry probes. Vadose Zone Journal 4(4): 1080-1086, 2005

Use of time domain reflectometry (TDR) to measure the water content of sandy soils. Australian Journal of Soil Research 33(2): 265-276, 1995

Combination of micro suction cups and time-domain reflectometry to measure osmotic potential gradients between bulk soil and rhizosphere at high resolution in time and space. European Journal of Soil Science 55(3): 497-504, 2004

A time domain reflectometry method to measure immobile water content and mass exchange coefficient. Soil Science Society of America journal2000 64(6): 1911-1917, 2000

The use of insulated time-domain reflectometry sensors to measure water content in highly saline soils. Irrigation science 18(2): 55-61, 1998

An automatic time domain reflectometry device to measure and store soil moisture contents for stand-alone field use. International Agrophysics 9(3): 235-241, 1995

Analysis of soil water dynamics in an agroforestry system based on detailed soil water records from time-domain reflectometry. Hydrology and Earth System Sciences 3(4): 517-527, 1999

Measurements of soil water content using Time Domain Reflectometry sensor and water vapor in surface soil at the gobi site in the Taklimakan Desert. Journal of the Meteorological Society of Japan 83(6): 987-999, 2005

Application of time-domain reflectometry (TDR) soil moisture miniprobe for the determination of unsaturated soil water characteristics from undisturbed soil cores. Irrigation Science 13(2): 65-72, 1992

Soil Water Measurement by Time Domain Reflectometry. Encyclopedia of water science edited by BA Stewart Terry A Howell: 898, 2003

The effect of soil texture on the time domain reflectometry calibration for soil water content measurement. Pochvovedenie 0(1): 21-28, 1998

Time domain reflectometry in the determination of soil water content. Revista Brasileira de Engenharia Agricola e Ambiental 10(2): 306-314, 2006

Measurement of soil water content using time domain reflectometry. Proceedings of the Canadian Hydrology Symposium Associate Committee on Hydrology: 69-287, 1982

Using time-domain reflectometry to determine water content in the soil. Pochvovedenie 0(10): 1263-1270, 1996