Navigation Links
Describing soils: Calibration tool for teaching soil rupture resistance
Date:1/5/2009

MADISON, WI, January 5, 2009 -- A new calibration tool was recently developed to help students and soil scientists calibrate their thumb and forefinger for the correct amount of pressure.

C.A. Seybold and colleagues, USDA-NRCS, Lincoln, NE, write about this new tool in the 2009 issue of Journal of Natural Resources and Life Sciences Education.

Rupture resistance is a measure of the strength of a soil to withstand an applied stress or resist deformation. In soil survey, during routine soil descriptions, rupture resistance is described for each horizon or layer in the soil profile. The current rupture resistance classes were developed from the qualitative consistence classes in the 1951 Soil Survey Manual and from studies that developed quantitative class limits. The lower portion of the rupture resistance classes are assigned based on the rupture force exerted between thumb and forefinger.

"The problem is that the tactile sense of the pressure can vary considerably between individuals," explains Seybold.

Here is how the new calibration tool works, according to Seybold. There are four pressure calibration tool assemblies measuring 8, 20, 40, and 80 N of applied pressure. The assemblies consist of a compression spring between two door-pulls (knobs) where the force exerted is calibrated using a top loading balance. Cap screws inserted into the door-pulls are adjusted so that the desired force is exerted just as the cap screws touch. The cap screws differ in height for each assembly.

The calibration tools are demonstrated on how the combinations of spring/knobs are put together to get different rupture pressures. Manufactured or substitute fragments for natural soil fragments are described that can be used in the instruction of rupture resistance in the class room.

Seybold has discovered that, in soil survey, this tool has been effective in calibrating the finger-force range for rupture resistance class placement for the last two decades. The calibration tools have become a part of the tool set carried by field soil scientists for use when describing soils.


'/>"/>

Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Related biology news :

1. JILA finds flaw in model describing DNA elasticity
2. A roadmap for calibration and validation
3. A unique experiment with chlorine -- and a new way of teaching
4. An intelligent new way to support the teaching of evolution
5. Evolution education is a must says coalition of scientific and teaching organizations
6. Biophysical Society to host discussions on the teaching of evolution and on the energy crisis
7. Meeting the challenges of teaching agriculture
8. NSF grant to launch undergrads from Case Western Reserve into math and science teaching
9. New manual presents robust, state-of-the-art proteomics methods for teaching and research
10. Researchers discover new strategies for antibiotic resistance
11. St. Jude finds factors that accelerate resistance to targeted therapy in lymphoblastic leukemia
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/30/2017)... The research team of The Hong Kong Polytechnic University (PolyU) ... ground breaking 3D fingerprint minutiae recovery and matching technology, pushing contactless ... use in identification, crime investigation, immigration control, security of access and ... ... A research team led by Dr Ajay Kumar ...
(Date:3/27/2017)... ROCKVILLE CENTRE, N.Y. , March 27, 2017 ... by Healthcare Information and Management Systems Society (HIMSS) ... Analytics Outpatient EMR Adoption Model sm . In ... top 12% of U.S. hospitals using an electronic ... recognized CHS for its high level of EMR ...
(Date:3/23/2017)... Research and Markets has announced the addition of the ... to 2025" report to their offering. ... The Global Vehicle Anti-Theft System Market ... the next decade to reach approximately $14.21 billion by 2025. ... for all the given segments on global as well as regional ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... ... 2017 , ... Beaker, the industry’s pioneer in developing customizable ... industry, today announces a strategic partnership with Alcami Corporation, a leading global Contract ... expertise in executive recruitment solutions, providing Alcami with access to the best talent ...
(Date:6/22/2017)... (PRWEB) , ... June 22, 2017 , ... ... health leaders in designating infertility as a disease, bringing new hope for prospective ... at their 2017 annual meeting to back the World Health Organization’s designation in ...
(Date:6/22/2017)... MD (PRWEB) , ... June 22, 2017 , ... ... solutions provider, announced the release of Limfinity® version 6.5, a content-packed update to ... framework continue to gain a larger and more diverse base of customers among ...
(Date:6/20/2017)... ... 20, 2017 , ... HorizonScan is providing food and ingredient ... likely threat to their products at the annual IFT conference in Las Vegas, ... expo attracts over 20,000 attendees representing food science professionals from over 90 countries ...
Breaking Biology Technology: