Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Using frequency waves to measure moisture in soil

16.06.2003


New findings improve the way we take and analyze field measurements



A more accurate and robust method to measure the water content in soil is now available, thanks to a study conducted by researchers from National Chiao Tung University in Taiwan.
Researchers have developed a numerical model for simulating the waveform in soil by using Time Domain Reflectometry (TDR) and a new calibration equation. The results are published in the May/June issue of Soil Science Society of America Journal. Chih-Ping Lin, assistant professor of civil engineering, was the lead scientist on the research, conducted from 1999 to 2001 with support from the National Science Council, Taiwan.

"The TDR waveforms vary not only with the soil water content, but also with the soil types, bulk density, and probe parameters," said Lin. "If these factors can be taken into account in the analysis, we can have a better algorithm for determining the soil water content."



TDR measurement has become a widely adopted method for monitoring soil water content. The article examines the limitations of the traditional data reduction method for determining water content and proposed a new method. The result is a better automatic data reduction algorithm. Previous studies of TDR waveforms used sophisticated probes that were not appropriate for field applications and had limited values to the agronomy and geotechnical engineering community. The new finding connects the gap between the theoretical analysis and the field measurement.

"Now with almost any kind of probe and cable system, one can measure the frequency-dependent dielectric permittivity of the soil in the field," Lin said. "This will not only improve the soil moisture measurements but also have impacts on the characterization of soil-water interaction."


Soil Science Society of America Journal (SSSAJ), http://soil.scijournals.org is a peer-reviewed, international journal of soil science published six times a year by the Soil Science Society of America. SSSA Journal contains soil research relating to physics; chemistry; biology and biochemistry; fertility and plant nutrition; genesis, morphology, and classification; water management and conservation; forest and range soils; nutrient management and soil and plant analysis; mineralogy; and wetland soils.

The American Society of Agronomy (ASA) www.agronomy.org, the Crop Science Society of America (CSSA) www.crops.org and the Soil Science Society of America (SSSA) www.soils.org are educational organizations helping their 10,000+ members advance the disciplines and practices of agronomy, crop and soil sciences by supporting professional growth and science policy initiatives, and by providing quality, research-based publications and a variety of member services.

Sara Uttech | EurekAlert!
Further information:
http://www.asa-cssa-sssa.org/
http://soil.scijournals.org

More articles from Agricultural and Forestry Science:

nachricht Six-legged livestock -- sustainable food production
11.05.2017 | Faculty of Science - University of Copenhagen

nachricht Elephant Herpes: Super-Shedders Endanger Young Animals
04.05.2017 | Universität Zürich

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>