Post on 23-Feb-2016
description
Extra crop competition with weeds by increasing wheat seeding ratePeter Newman
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90
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Seeding rate(kg/ha)
Ryeg
rass
hea
ds/m
2
Row spacing(mm)
David Minkey, MerredinNear perfect data set from the 90’s
It’s possible to improve competition with weeds byReducing row spacingIncreasing seeding rateBoth!
30 kg/ha60 kg/ha
90 kg/ha120 kg/ha
0
50
100
150
200
250
300
Brome + ryegrass seed heads /m2
7" Rows
14" Rows
Seeding rate
Row spacing
1999 - Mingenew• More practical seeding
rates & row spacings
• Increasing competition reduces weed seed set
• Little benefit in increasing seeding rate above 60 kg/ha
Pani
cles
/m2
2012 – MingenewMinus Sakura
40kg/ha 80kg/ha 120kg/ha 160kg/ha0
3000
6000
9000
12000
15000
18000
Seeding rate
Rye
gras
s se
eds
/m2
• Increasing the wheat seeding rate decreases ryegrass seed set in the absence of pre-emergent herbicide
40kg/ha 80kg/ha 120kg/ha 160kg/ha0
100
200
300
400
500
600
700
800
900
Seeding rate
Ryeg
rass
seed
s /m
2
• Higher wheat seeding rates significantly reduced ryegrass seed set where Sakura was applied pre-sowing
2012 – MingenewPlus Sakura
40kg/ha 80kg/ha
120kg/ha 160kg/ha
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Screenings %
Mingenew
Binnu
Seeding Rate
Scre
enin
gs %
Many growers comment that high wheat seeding rates results in high wheat screenings levels (small grain).
However, these two trials and many more like them show that there is no impact of high wheat seeding rates on screenings
40 kg/ha 160 kg/ha• Impact of high
wheat seeding rates on wild radish growth
• The radish were present in a narrow, un-sprayed strip across the trial
Binnu trial 2012Wild radish
40kg/ha 80kg/ha
120kg/ha 160kg/ha
0
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wheat dry weightradish dry weight m2
Seed rate
Dry
wei
ght (
g/m
2)
Un-sprayed radish
• High wheat seeding rates increased wheat biomass & decreased wild radish biomass
Wheat & radish dry weight
40kg/ha 80kg/ha 120kg/ha 160kg/ha0
500
1000
1500
2000
Wheat seeding rate
Whe
at y
ield
(kg/
ha)
• Problem with high seeding rates is often no responsein wheat yield
• 40 kg/ha seed rate achieved optimal wheat density
• Increased cost without increasing yield
Wheat yield
40kg/ha80kg/ha
120kg/ha160kg/ha
0
500
1000
1500
2000
2500
Minus SakuraPlus Sakura
Seeding rate
Whe
at y
ield
(kg/
ha)
Wheat yield
Summary• Increasing the seeding rate is a simple, effective method to increase
crop competition
• Often requires an increase in cost & is an inconvenience at seeding time, often with no yield benefit
• Limit to the extra competition that can be achieved
• May be more cost effective to increase crop competition through row spacing & crop row orientation