Weed: Treatments, Weeds, and Application Methods Data
General
After Go> is clicked for Weed Layer (Select Layers screen), a dialog box is displayed for entering the name of the field that stores the weed names in the Weed Layer:
After this name is supplied, the Weed: Treatments, Weeds, and Application Method Data form (shown below) is displayed. On this data entry form you will identify, for each invasive species, a chemical treatment to be analyzed, its application rate per acre, how much of which surfactant, and the cost per acre for the chemical (we will add the application method cost later). This form contains four tabs: Treatments data, Weed rank and spread rates, Application methods data, Treatment/Method.
Weed Rank and Spread Rate Tab
This tab is used to specify a treatment priority ranking for each weed species, and to enter a rate of spread that is expected in the absence of treatment.
Selections and data entry are made on the top portion of the screen, then the Add>> button is used to enter a data row in the table in the lower portion of the screen.
Screen Items
- Select Weed: Select a weed for ranking and spread rate. Two or more may be selected (using shift or control keys) providing they share the same ranking and spread rate.
- Rank (1-6): Specify a ranking from 1 - 6 for the weed(s) selected, where 1 = the highest priority for treatment and 5 = the lowest priority for treatment. Select 6 if the weed(s) selected does not have a treatment priority. This relative priority is used by the objective function to minimize the infested acres over time by invasive species priority and site priority.
- Spread rate (ft/year): Enter a rate of spread (feet/year) for the weed(s) selected. This rate estimates the expansion potential (without treatment) of an infested area and is used as an omnidirectional growth rate, that is, each year of expansion uses this spread rate in every direction from the perimeter of the previous year's extent.