1 / 17

Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI

Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI. Blackgrass ( Alopercurus myosuroides ). Old Seed Bank. Stochastic Germination. Plants germinating. Stochastic Seed Mortality. Dose- response. Plants surviving. Crop Weed Competition. Crop Weed

pereyra
Download Presentation

Threshold vs. adjusted dosage Svend Christensen and Torben Heisel, DIAS Mark Paice SRI

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Threshold vs. adjusted dosageSvend Christensen and Torben Heisel, DIASMark Paice SRI

  2. Blackgrass (Alopercurus myosuroides)

  3. Old Seed Bank Stochastic Germination Plants germinating Stochastic Seed Mortality Dose- response Plants surviving Crop Weed Competition Crop Weed Competition Seed Production and Dispersal New Seeds Yield Loss Economic Model Cost New Seed Bank Herbicide - use Stochastic Weed Control Stochastic Seed Mortality

  4. Initial Blackgrass Data • Blackgrass density was measured in a 14 m x 14 m grid in a winter barley at Silsoe Research Institute • The model unit was 1 m by 1 m cells • Treatment unit was 4 m by 4 m cells

  5. Spatial weed management of Blackgrass • The threshold algorithm • PC-Plant Protection • DAPS (Decision Algorithm for Patch Spraying)

  6. The Threshold Algorithm If Blackgrass density was higher than 1 plant m-2 A normal dose of 3.5 l ha-1 IPU was applied

  7. PC-Plant Protection A normal dose of 2.1l ha-1 IPU was applied

  8. Input data Output data Point or zone model Competition model PC-Plant Protection Decision model DAPS - Decision Algorithm for Patch Spraying

  9. ResultsSeed Bank

  10. Year 0 Seeds/m2 20 m

  11. Year 1 Year 3 Seeds/m2 Seeds/m2 Year 5 Year 7 Seeds/m2 Seeds/m2 The Threshold Algorithm

  12. Year 1 Year 3 Seeds/m2 Seeds/m2 Year 5 Year 7 Seeds/m2 Seeds/m2 PC-Plant Protection

  13. Year 1 Seeds/m2 Year 3 Year 5 Year 7 Seeds/m2 Seeds/m2 Seeds/m2 Decision algorithm for Patch Spraying

  14. Yield loss (DKK ha-1)

  15. IPU dose (l ha-1)

  16. Cost (DKK ha-1)

  17. Model Assumptions • The size of the treatment area affects the differences between the algorithm • No spatially or temporally depended effect of soil conditions or cultivation factors on seed emergence, crop weed competition or seed production

More Related