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Site-specific Wild Oat Operation Program (SWOOP)

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. 1. Associations among site properties and abundance of wild oats. Soil types.

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Site-specific Wild Oat Operation Program (SWOOP)

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  1. 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

  2. 1. Associations among site properties and abundance ofwild oats

  3. Soil types Wild oat density 2 3 1

  4. 2. Detection systems for wild oat patches

  5. Counting contacts

  6. Visual assesment / walk

  7. Visual assesment / combine

  8. Economic comparison (C/ha)between the three assessment methods MethodContacts 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

  9. 3. Testing the SWOOP concept

  10. Infestation map Infestation level 0 (<0,1 panícules/m2) 1 (0,1-1 panícules/m2) 2 (1-10 panícules/m2) 3 (> 10 panícules/m2)

  11. 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

  12. Effects on barley yields

  13. 4. Studying the spatial stability of wild oat patches

  14. From season to season Relationship between: - panicle density (at harvest time) and - seedling density (at treatment time, next year) Abundance Presence R2 = 0,59

  15. Among various seasons N 1999 2000 2001 2002 STABILITY IN LOCATION

  16. STABILITY IN LOCATION Test for stability of spatial distribution (Syrjala, 1996)

  17. STABILITY IN DENSITY Seedlings/m2 2002 1999 2000 2001

  18. STABILITY IN DENSITY 4 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

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