1a.Objectives (from AD-416):
1. Complete statistical analysis on yellow starthistle field study.
2. Complete computer model parameterization.
3. Complete journal articles on joint research.
1b.Approach (from AD-416):
1. Field data collected during 2007 and 2008 will be statistically evaluated and summary graphics prepared.
2. Statistically significant biological parameters will be developed and incorporated into an existing hermes model of yellow starthistle growth.
3. Both field data on yellow starthistle growth and model development and application will be published in peer reviewed journals.
This research addresses Objectives 2 and 3 in the parent project which focuses on the development and application of predictive models for weed management. The ADODR directly participates in research planning and implementation with the University of California Santa Cruz staff that is conducting yellow starthisle modeling studies. Although most of the project goals were met in 2011, the project has continued this past year to allow data analysis and manuscript preparation to continue. Of particular importance is the team’s models that allowed the prediction of Photosynthetic Active Radiation (PAR) from other more common measures of sunlight intensity. This model was used to predict the amount of light available to plants for growth under varying sky conditions that occur throughout California. This in turn was used in developing and implementing weed growth and management models to aid in yellow starthistle control across complex watersheds.