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:1/24/2017)... -- It sounds simple and harmless—an electronic sensor attached ... and alerts parents on their smart phones if, ... But pediatric experts argue that such devices may ... of medical benefits, especially to healthy babies. ... of healthy babies, promising peace of mind about ...
(Date:1/21/2017)... Research and Markets has announced the addition ... to their offering. ... The global voice recognition biometrics market to grow at a ... report covers the present scenario and the growth prospects of the ... size, the report considers the revenue generated from the sales of ...
(Date:1/19/2017)... SANTA CLARA, Calif. , Jan. 19, 2017 ... Valley company enhancing user experience and security for ... provider of next-generation payment processing systems and cybersecurity ... assist more banks, enterprises and financial institutions worldwide ... As part of the end-to-end secure user authentication ...
Breaking Biology News(10 mins):
(Date:2/20/2017)... CA (PRWEB) , ... February 20, 2017 , ... ... infections in patients with catheters associated with peritoneal dialysis, announced today that it ... peritoneal dialysis catheter connection system in Peritoneal Dialysis International (PDI), the official ...
(Date:2/20/2017)...  At the 2017 Health Information Management Systems ... , IBM (NYSE: IBM ) today introduced ... President and CEO Ginni Rometty will ... 8:30-10 am ET, broadcast live on www.ibm.com ... examine the advent of the Cognitive Era and ...
(Date:2/19/2017)... ... February 19, 2017 , ... Expanding Portfolio to Include Lab ... equipment with the goal of expanding the reach of its quality and precision ... water analysis meters were introduced into the market in 2014. , The OHAUS ...
(Date:2/18/2017)... ... February 17, 2017 , ... The ... and the Center for International Blood & Marrow Transplant Research (CIBMTR) will take ... , The combined scientific sessions offer investigators, clinicians, laboratory technicians, clinical ...
Breaking Biology Technology: