round up ready corn management practices
TRANSCRIPT
Take the STRESS away
Round Up Ready Corn
Eliminate the STRESS
• The introduction of Round Up Ready over
10 years old
• Has added a whole new dimension to
weed control in beans and cotton
• Has been in corn for about 5 years
• Yield drags in the original RR event were
eliminated in the RR2 event
Eliminate the STRESS
• VT technology has shown to be over 95%
accurate with gene splicing virtually
eliminating any “surprises” when new
introductions are made
• The stresses caused by soil borne insects
are eliminate by the seed (BT, CRW)
• You must still plant based on the
performance
Eliminate the STRESS
POINT OF INTEREST
TRIPLE STACK hybrids
have shown to have
greater stress tolerance
than their sister lines
without the triple stack
trait
Could it be from just having
less root stress? Note smaller plant 1 stage behind
other and will take nutrients that
stronger plant could use for grain fill
Eliminate the STRESS
• Weed pressure still must be controlled
• Many of our herbicides do have some sort
of effect on hybrids (they are plant killers)
• Safeners do help off set some of the
stresses caused by some herbicides
• Programs with least stress and solid weed
control are best
Eliminate the STRESS
• Grasses must be
contained through the
critical stages of high
nutrient uptake
• ALS chemistry can
stunt ears and holds
plants back
• High rates of PGR
can stunt corn
140
160
180
200
220
1" 3" 5" 7" 9"
Weed Height at Post Application
Co
rn Y
ield
(b
u./
A)
Glyphosate alone
Pre fb Glyphosate
*University of MN Research Results
3-5 Days
Eliminate the STRESS
• Round Up Varieties give a good post
option of Round Up for good general
contact control---No residual!!
• Many “full boat” programs run out of
residual chemistry in adverse seasons
• The residual “clock” needs to be reset for
best full season weed control.
Eliminate the STRESS
• Guardsman Max
– Frontier+Atrazine
– No stress like Dual
– Atrazine good basic
broadleaf herbicide
– Very water soluble
combination
– What about trizine
weed control??
PL
AN
T A
PR
IL 1
0
EA
R S
TA
RT
TO
FO
RM
SIL
KS
EM
ER
GE
PO
LL
EN
SH
ED
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
SETTING THE RESIDUAL WEED CONTROL CLOCK
S E A S O N L O N G C O N T R O L
THE FIRST PART OF THE RESIDUAL CLOCK SECOND APPLICATION OF RESIDUAL RESETS THE CLOCK
TIME OF MAXMIMUM NITROGEN DRAW
Time of Ear Formation and Grain Fill
MAY JUNE JULY AUGUSTAPRIL
Eliminate the STRESS
• Prowl H20 1.5
pt
• Added with
Clarity
• Osprey for blue
grass
• Picture taken
over 10 weeks
after applied
Eliminate the STRESS
• RESET the clock
• Let trizine weeds
emerge
• Round Up (add 2-4 oz
Clarity if needed)
• PROWL H20 resets
the residual clock for
season long trizine
weeds, grass!
• NO STRESS!
Eliminate the STRESS
• Prowl is SAFE on all emerged grasses
• Tank mix partner such as Clarity in conventional hybrids will control broadleaf weeds
• Control grasses up to Prowl application with Guardsman, Princep