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 Climate change, population growth may lead to open ocean aquaculture
05.10.2017 | Oregon State University

nachricht New machine evaluates soybean at harvest for quality
04.10.2017 | University of Illinois College of Agricultural, Consumer and Environmental Sciences

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: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

Im Focus: New nanomaterial can extract hydrogen fuel from seawater

Hybrid material converts more sunlight and can weather seawater's harsh conditions

It's possible to produce hydrogen to power fuel cells by extracting the gas from seawater, but the electricity required to do it makes the process costly. UCF...

Im Focus: Small collisions make big impact on Mercury's thin atmosphere

Mercury, our smallest planetary neighbor, has very little to call an atmosphere, but it does have a strange weather pattern: morning micro-meteor showers.

Recent modeling along with previously published results from NASA's MESSENGER spacecraft -- short for Mercury Surface, Space Environment, Geochemistry and...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

Conference Week RRR2017 on Renewable Resources from Wet and Rewetted Peatlands

28.09.2017 | Event News

 
Latest News

A single photon reveals quantum entanglement of 16 million atoms

16.10.2017 | Physics and Astronomy

The melting ice makes the sea around Greenland less saline

16.10.2017 | Earth Sciences

On the generation of solar spicules and Alfvenic waves

16.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>