Extra crop competition with weeds by increasing wheat seeding rate
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Extra crop competition with weeds by increasing wheat seeding rate Peter Newman
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Extra crop competition with weeds by increasing wheat seeding rate. Peter Newman. Hi! Thanks for downloading our presentation. There’s additional information for you to use in the notes section below each slide, just be sure to leave all the logos where they are. - PowerPoint PPT Presentation
Transcript of Extra crop competition with weeds by increasing wheat seeding rate
Extra crop competition with weeds by increasing wheat seeding ratePeter Newman
Hi!
Thanks for downloading our presentation.
There’s additional information for you to use in the notes section below each slide, just be sure to leave all the logos where they are.
If you have any questions, please contact Peter Newman, T: 08 9964 1170, E: [email protected].
Thank you,The AHRI Communication Team(Peter Newman, Brogan Micallef & Lisa Mayer)
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Seeding rate(kg/ha)
Ryeg
rass
hea
ds/m
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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
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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
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Seeding rate
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gras
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eds
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• Increasing the wheat seeding rate decreases ryegrass seed set in the absence of pre-emergent herbicide
40kg/ha 80kg/ha 120kg/ha 160kg/ha0
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Seeding rate
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rass
seed
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• Higher wheat seeding rates significantly reduced ryegrass seed set where Sakura was applied pre-sowing
2012 – MingenewPlus Sakura
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120kg/ha 160kg/ha
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Screenings %
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Binnu
Seeding Rate
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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
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120kg/ha 160kg/ha
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wheat dry weightradish dry weight m2
Seed rate
Dry
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ght (
g/m
2)
Un-sprayed radish
• High wheat seeding rates increased wheat biomass & decreased wild radish biomass
Wheat & radish dry weight
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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
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Minus SakuraPlus Sakura
Seeding rate
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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
