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New Planting Constraints
These constraints restrict the level of new planting or the amount of land that can be introduced into the model that was not initially present.
In effect, these are the same as replanting constraints that restrict the amount of ‘Bareland’ planted into all other croptypes. In the figure above the amount of bareland converted into croptypes in Otago and Southland each year must be less than 100.
These constraints are necessary if it has been specified in the Replanting form that replanting is allowed from ‘Bareland’. Without them the problem will be unbounded.
The LOG 2.0 new planting constraint window is shown below.
This option specifies what periods the constraint is to apply. Checking the box All will mean that the constraint will apply for all periods. Alternatively, a period range can be entered by entering the first and last periods in the two boxes below.
Rather than repeatedly specifying the same constraint for different croptypes or age classes, the For Each option allows the same constraint be applied to every individual croptype or class of croptypes selected in the Croptype Range.
This option means that a single constraint will be applied to the model that encompasses all the croptypes or classes of croptypes specified in the Croptype Range in the constraint.
Depending on what is selected in the Category field, a range of croptypes or attribute names will be available in the Croptype Range list. Using the mouse, highlight the desired croptype ranges for which the current clearfell specification is to apply. To select consecutive items in the list, click the first item, press and hold down the [SHIFT] key and click the last item. To select non-consecutive items, press and hold [CTRL] and click each item.
State whether the constraint is to set the amount planted is either equal to "=", less than "<" or greater than ">" the stated change.
The amount of area the constraint applies to.
The latest version of LOG now includes error checks on all inputs. This means that all fields need to have appropriate entries before the addition to the model is added. If there is something missing, or something in the wrong form, then a message is shown that prompts the user to remedy the situation.
The New Planting Constraint also gives the user a message when the 'OK' button is clicked. The message just prompts the user to make sure that constraints exist that limit the New Planting.