Pick up know-how for tackling diseases, pests and weeds.
Farm bill, farm marketing, agribusiness webinars, & farm policy.
Find tactics for healthy livestock and sound forages.
Scheduling and methods of irrigation.
Explore our Extension locations around the state.
Commercial row crop production in Arkansas.
Agriculture weed management resources.
Use virtual and real tools to improve critical calculations for farms and ranches.
Learn to ID forages and more.
Explore our research locations around the state.
Get the latest research results from our county agents.
Our programs include aquaculture, diagnostics, and energy conservation.
Keep our food, fiber and fuel supplies safe from disaster.
Private, Commercial & Non-commercial training and education.
Specialty crops including turfgrass, vegetables, fruits, and ornamentals.
Find educational resources and get youth engaged in agriculture.
Gaining garden smarts and sharing skills.
Timely tips for the Arkansas home gardener.
Creating beauty in and around the home.
Maintenance calendar, and best practices.
Coaxing the best produce from asparagus to zucchini.
What’s wrong with my plants? The clinic can help.
Featured trees, vines, shrubs and flowers.
Ask our experts plant, animal, or insect questions.
Enjoying the sweet fruits of your labor.
Herbs, native plants, & reference desk QA.
Growing together from youth to maturity.
Crapemyrtles, hydrangeas, hort glossary, and weed ID databases.
Get beekeeping, honey production, and class information.
Grow a pollinator-friendly garden.
Schedule these timely events on your gardening calendar.
Equipping individuals to lead organizations, communities, and regions.
Home to the Center for Rural Resilience and Workforce Development.
Guiding entrepreneurs from concept to profit.
Position your business to compete for government contracts.
Find trends, opportunities and impacts.
Providing unbiased information to enable educated votes on critical issues.
Increase your knowledge of public issues & get involved.
Research-based connection to government and policy issues.
Support Arkansas local food initiatives.
Read about our efforts.
Preparing for and recovering from disasters.
Licensing for forestry and wildlife professionals.
Preserving water quality and quantity.
Cleaner air for healthier living.
Firewood & bioenergy resources.
Managing a complex forest ecosystem.
Read about nature across Arkansas and the U.S.
Learn to manage wildlife on your land.
Soil quality and its use here in Arkansas.
Learn to ID unwanted plant and animal visitors.
Timely updates from our specialists.
Eating right and staying healthy.
Ensuring safe meals.
Take charge of your well-being.
Cooking with Arkansas foods.
Making the most of your money.
Making sound choices for families and ourselves.
Nurturing our future.
Get tips for food, fitness, finance, and more!
Understanding aging and its effects.
Giving back to the community.
Managing safely when disaster strikes.
Listen to our latest episode!
July 1, 2014
FAYETTEVILLE, Ark. -- The porous nature of the land that underlies the Ozark Plateau
doesn't necessarily mean high-speed transport of phosphorus away from fields on which
fertilizer has been spread to nearby streams, according to an article published in
the Journal “Environmental Science and Technology.”
Karst landscapes, such as those in the Ozarks, are often seen as highly vulnerable
to loss of nutrients such as phosphorus from the surface because of underlying features
that can range in size from small fissures to large caves. How fast the phosphorus
moves depends on the unique characteristics of each site. In the case of this study,
continuous layers of chert -- a silica-rich sedimentary rock -- separate the surface
from the underlying limestone karst, slowing the flow of water, and phosphorus into
The article, “Phosphorus Retention and Remobilization along Hydrological Pathways
in Karst Terrain,” published this spring, challenges the assumption that karst landscapes
are always highly vulnerable to agricultural phosphorus and other nutrients found
in manure and other fertilizers. The study was conducted at the Savoy Beef Farm in
northwest Arkansas. Researchers from several university departments have been collaborating
on joint research on nutrient flows in the karst at the Savoy farm for many years.
The article’s 10 co-authors include three of the scientists studying the impact of
the hog farm in the Buffalo River watershed: Andrew Sharpley, professor, University
of Arkansas System Division of Agriculture; John Van Brahana, University of Arkansas
emeritus professor of Geosciences in Fulbright College, and Brian Haggard, director
of the Arkansas Water Resources Center, part of the Division of Agriculture.
“Our results suggest that karst drainage may, in some cases, provide a greater phosphorus
sink than previously considered,” Sharpley said. However, while karst may hold phosphorus
more tightly than previously thought, the researchers noted that “the retained phosphorus
may become a long-term source -- a decade or more -- of slowly-released ‘legacy’ phosphorus
via soil drainage and springs to surface waters.”
The authors said further work would be needed to determine the ecological impacts
of the release of these nutrients into receiving streams.
Other authors are Helen Jarvie and Colin Neal, Alan Lawlor, Darren Sleep and Sarah
Thacker of the Centre for Ecology & Hydrology in the U.K.; and Tarra Simmons and April
Price of the UA’s Division of Agriculture.
The study may be found online at http://pubs.acs.org/doi/abs/10.1021/es405585b.
The University of Arkansas System Division of Agriculture offers its programs to all
eligible persons regardless of race, color, national origin, religion, gender, age,
disability, marital or veteran status, or any other legally protected status, and
is an Affirmative Action/Equal Opportunity Employer.
By U of A Division of Agriculture
Media Contact: Mary HightowerDir. of Communication ServicesU of A Division of AgricultureCooperative Extension Service(501) firstname.lastname@example.org