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By Mary HightowerThe Cooperative Extension ServiceU of A System Division of Agriculture
(Newsrooms: with art at www.flickr.com/photos/uacescomm/20017382889, www.flickr.com/photos/uacescomm/20017431299, www.flickr.com/photos/uacescomm/20195893612 )
ROHWER, Ark. –There’s an odd tool that’s appearing in maturing corn plots around Arkansas:
what looks like a pair of red bolt cutters coupled together, with the cutting heads
precisely 8 inches apart.
With it, researchers with the University of Arkansas System’s Division of Agriculture
are cutting uniform corn stalk sections at a set height above the ground as a means
to see how efficiently the plant has been using nitrogen applied as fertilizer.
The results of Corn Stalk Nitrogen Test, or CSNT, can give farmers and researchers
“a report card on how you did with your nitrogen,” said Trent Roberts, assistant professor-Crops,
Soil and Environmental Science.
CSNT was developed in the 1990s and is commonly used throughout the Midwest’s Corn
Belt. Roberts said the Natural Resource Conservation Service of the U.S. Department
of Agriculture “is using it as a check. Are these producers optimizing or over-fertilizing?
The NRCS “has this program nationwide and in each state, the criteria is based on
land grant university recommendations,” Roberts said. “For NRCS to correctly implement
the program, we have to have university guidelines.”
South vs. Midwest
That’s where the Division of Agriculture comes in.
The difference between the Corn Belt and Arkansas is that Midwest farmers have to
rely on rain. In Arkansas, “they can make it rain anytime they want to” with irrigation.
“Nothing like that has ever been done in irrigated corn in the South,” Roberts said.
“What grad student Chester Greub and I are researching is whether limits in the upper
Midwest are accurate in the South.
“The verification program was a good place to get data to see what types of levels
occur in irrigated land,” he said.
The Corn Research Verification Program in Arkansas has seven test plots in Clay, Lee,
Lincoln, Lonoke, Pope and St. Francis counties covering about 350 acres. The program
gives real-world application to improved production techniques suggested by other
Roberts, Greub and the corn verification team began work on creating a set of recommendations
“We're hoping that after this year, we’ll have sufficient data to set those limits,”
Roberts said. “If you are below that value, then the corn is deficient. If it’s between
this value and another value, then it’s optimum. If it’s above that upper optimum
value, then it was excessive or over-fertilized.”
Arkansas farmers planted 500,000 acres of corn in 2015, down from last year’s 540,000
For more information on crop production, contact your county extension office or visit
www.uaex.uada.edu, or http://Arkansascrops.com.
The University of Arkansas System Division of Agriculture offers all its Extension
and Research programs and services without regard to race, color, sex, gender identity,
sexual orientation, national origin, religion, age, disability, marital or veteran
status, genetic information, or any other legally protected status, and is an Affirmative
Action/Equal Opportunity Employer.
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Media Contact: Mary HightowerDir. of Communication ServicesU of A Division of AgricultureCooperative Extension Service(501) email@example.com