oat response to imazapic residues
DESCRIPTION
Oat Response to Imazapic Residues. E. P. Prostko, T.L. Grey, and R. N. Morgan Department of Crop & Soil Sciences University of Georgia Tifton. WSSA - 2005. Imazapic. trade named - CADRE BASF product labeled for peanut in 1996 postemergence nutsedges broadleaf small grasses - PowerPoint PPT PresentationTRANSCRIPT
Oat Response to Oat Response to Imazapic ResiduesImazapic Residues
E. P. Prostko, T.L. Grey, and R. N. Morgan
Department of Crop & Soil Sciences
University of Georgia
TiftonWSSA - 2005
Imazapic Imazapic trade named - CADRE BASF product labeled for peanut in 1996 postemergence
– nutsedges– broadleaf– small grasses
very popular– 64% in GA
$15-16/A rotation restrictions
Cadre Rotational RestrictionsCadre Rotational Restrictions
Small Grains in GeorgiaSmall Grains in GeorgiaPlanted AcresPlanted Acres
100
270
380
80
230
330
0
75
150
225
300
375
450
Oats Rye Wheat
Crop
Acr
es
(X 1
000)
2002-2003
2003-2004
Source: GASS
Materials and Methods - IMaterials and Methods - I
small plot techniques 4 replications imazapic @ 1.44 ozs/A
applied to bare ground first week of May, June,
July , August, September ‘Coker 227’ oats planted
first week of October 3 locations no tillage after initial bed
formation
Materials and Methods - IIMaterials and Methods - IIData CollectedData Collected
stand counts– 1-2 WAP
forage yields– machine harvested
in December and January
grain yields– machine harvested
in May
Soil TypesSoil Types
Tifton Plains
pH 6.0 6.01
OM (%) 1.24 <1.0
Sand (%) 96 71
Silt (%) 2 13
Clay (%) 2 16
ResultsResults
The influence of imazapic on oat standThe influence of imazapic on oat stand
8593 92
8795 92
0
20
40
60
80
100
Untre
ated M
ayJu
ne July
AugSep
t
Timing
plan
ts/m
eter
Averaged over 3 tests P = 0.60
The influence of imazapic on forage yieldThe influence of imazapic on forage yield
25462745
25442269
1977
975
0
500
1000
1500
2000
2500
3000
Untre
ated M
ayJu
ne July
AugSep
t
Timing
Dry
wei
ght
(kg/
ha)
Averaged over 3 tests
aa
aab
b
c
LSD
The influence of imazapic on grain yieldThe influence of imazapic on grain yield
32603029 2936
3135 3186 3257
0
700
1400
2100
2800
3500
Untre
ated M
ayJu
ne July
AugSep
t
Timing
kg/h
a
Averaged over 3 tests P = 0.1476
Cadre Injury SymptomsCadre Injury Symptoms
Untreated
Sept 3
June 4
May 1
Aug 5
July 1
CADRE/OATS TESTDecember 3, 2002
Oats planted October 2, 2002
CADRE/OATS TESTJanuary 21, 2003
Untreated
Sept 3
June 4
May 1
Aug 5
July 1
Oats planted October 2, 2002
Untreated Cadre 1 Month Before Planting
Photo 21 DAP, Tifton 2003
SummarySummary
oat stand was not reduced by any timing of imazapic
oat forage yield reduced when imazapic was applied in August and September (1-2 months before planting)
oat grain yield was not reduced by any timing of imazapic
ConclusionsConclusions
the oat rotation restriction does not need to be 18 months
should be equivalent to other small grains (4 months)