Sin ttulo de diapositiva

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Site-specific Wild Oat Operation Program (SWOOP)
C Fernandez-Quintanilla, J Barroso, D Ruiz Centre
for Environmental Studies, CSIC A Ribeiro, B
Diaz, MC Garcia Alegre, D Guinea Institute of
Automatics , CSIC
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1. Associations among site properties and
abundance of wild oats
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Soil types
Wild oat density
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3
1
4
2. Detection systems for wild oat patches
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Counting contacts
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Visual assesment / walk
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Visual assesment / combine
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Economic comparison (C/ha) between the three
assessment methods
Method Contacts Visual/walk
Visual/combine
Sampling cost 36 36 9
Herbicide cost 33 25
18
Fixed costs 289 289
289
Yield benefit 390
387 382
NET RETURN 32 37 66
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3. Testing the SWOOP concept
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Infestation map
Infestation level
0 (lt0,1 panícules/m2)
1 (0,1-1 panícules/m2)
2 (1-10 panícules/m2)
3 (gt 10 panícules/m2)
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Treatment map
Treatments
of area
None 28
Assert 0.6 l/ha 43
Assert 1.25 l/ha 22
Assert 2.5 l/ha 7
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Effects on barley yields
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4. Studying the spatial stability of wild oat
patches
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From season to season
Relationship between
- panicle density (at harvest
time) and - seedling density
(at treatment time, next year)
Abundance
Presence
R2 0,59
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Among various seasons
N
1999 2000 2001
2002
STABILITY IN LOCATION
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STABILITY IN LOCATION
Test for stability of spatial distribution
(Syrjala, 1996)
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STABILITY IN DENSITY
Seedlings/m2
2002
1999
2000
2001
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STABILITY IN DENSITY
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y -1,0424x 2086
2
R
0,81
3
y -0,9756x 1951,9
2
log seedlings/m2
2
R
0,69
1
y -0,587x 1174,5
0
2
R
0,61
1997
1998
1999
2000
2001
Years