|
 Someday
farmers will be able to kill red rice without killing
their rice. But until advancements such as Clearfield,
Roundup-Ready and Liberty-tolerant rice are available,
farmers can rotate rice and soybeans and kill the red
rice in their beans.
University of Arkansas Weed Scientist Ford Baldwin
says, "Red rice generally doesn't have much of an impact
on soybean yields unless you get into a real dense infestation.
But it's the No. 1 weed problem in rice.
"When you're paying money to control red rice in soybeans,
you're really doing it for your rice crop."
Baldwin, whose study of red rice control in soybeans
is funded by the Arkansas Soybean Promotion Board, says
the problem with trying to develop herbicides to control
red rice in rice is that the weed and the crop are of
the same genus and species. "We've never been able to
find a herbicide with the selectivity to distinguish
between the two.
"In soybeans, the pre-emergence herbicides Dual and
Frontier and post-emergence grass herbicides such as
Assure do a pretty good job of controlling red rice.
Roundup is very good on red rice, so I'm doing a lot
of work with Roundup-Ready beans."
Baldwin says the best program he's found for controlling
red rice in soybeans is a combination of a soil-applied
herbicide such as Dual followed by Roundup.
He says, "Roundup hasn't really been any better on
red rice than Assure, but Roundup controls other weeds
such as teaweed, morningglories and coffeebeans - weeds
that farmers would have to control with other herbicides
in their rice if they used Assure.
"Our Cadillac program right now is Dual or Frontier
followed by two one-pint applications of Roundup. The
first Roundup application is made around 14 days after
emergence, and the second about two weeks later."
Baldwin says his checkoff-funded studies have found
that the reduced "one pint followed by one pint" Roundup
rate provides good red rice control in soybeans. "The
timing is more important than the rate.
"The reduced rate may become less significant if the
price of Roundup continues to come down, but with our
low soybean prices, farmers are looking to save a buck
any way they can."
Baldwin says the emphasis on Roundup-Ready technology
may cause some companies to stop looking for alternative
products for weed control. "That's not good, because
when we get weed species shifts and resistance to Roundup,
we may not have the new herbicides we need.
"As a scientist, you never find a point where you
can stop doing research or fine-tuning a program. Not
every herbicide program that works well for me works
well for farmers, so we're trying to develop different
programs that farmers can pick and choose from."
Soybeans Today January 2000
Table of Contents
About the ASPB | ASPB Programs | Publications
Research Results | Arkansas
Ag Statistics | Internet Resources
Biodiesel Suppliers | Homepage
For additional information about any board-related activity contact:
Arkansas Soybean Promotion Board
ATTN: Brandy Carroll
P.O. Box 31
Little Rock, AR 72203-0031
Phone: 501-228-1268
Copyright © 2008 Arkansas Soybean Promotion Board.
All rights reserved.
Web
Services by
Aristotle Web Design.
Privacy Policy
|
