Plot placement systems and methods

1. A method for generating a plot in a field during a crop input application operation using a variable application implement, comprising:

displaying a geo-referenced map of the field;

prompting a user to select a marker location on said map, said marker location corresponding to at least one geo-referenced location in the field;

initiating the crop input application operation using the variable application implement;

applying a crop input on a first portion of the field at varying application rates according to a prescription map, said prescription map associating each of a plurality of regions in the field with one of a plurality of application rates; and

implementing a plot in the field, said plot defining a plot region within the field, said plot region being selected during the crop input application operation based on said marker location.

2. The method of claim 1 , wherein said prescription map calls for at least one prescription application rate within said plot region, wherein said crop input is applied at a plot application rate within said plot region, said plot application rate being different than said at least one prescription application rate, said plot application rate being determined prior to said crop input application operation.

3. The method of claim 2 , further including:

completing said plot;

exiting said plot region; and

applying said crop input to a remainder of the field at varying application rates according to said prescription map.

4. The method of claim 3 , further including:

storing a boundary of said plot region in memory.

5. The method of claim 4 , further including:

storing a modified prescription map in memory, said modified prescription map including said plot region; and

displaying said modified prescription map to the user.

6. The method of claim 3 , further including:

defining a leading edge of said plot region by the ordered steps of:

comparing a position of the implement to said marker location;

determining that the implement has passed over said marker location;

determining whether a new pass condition has been met; and

beginning application at said plot application rate after said new pass condition has been met.

7. The method of claim 6 , wherein said step of determining whether a new pass condition has been met includes determining whether the implement has stopped applying said crop input.

8. The method of claim 7 , wherein said step of determining whether a new pass condition has been met includes:

storing a first direction of the implement after the implement stops applying said crop input;

determining that the implement has been lifted;

determining that the implement has been lowered;

determining a second direction of the implement after the implement has been lowered;

comparing a change between said second direction and said first direction to a threshold; and

storing a new pass determination if said change exceeds said threshold.

9. The method of claim 6 , further including:

defining a terminal edge of said plot region by the ordered steps of:

determining whether a pass completion condition has been met;

terminating application at said plot application rate after said new pass condition has been met; and

resuming application according to said prescription map after said new pass condition has been met.

10. The method of claim 9 , wherein said step of determining whether a pass completion condition has been met includes:

determining whether the implement has been applying said crop input over a threshold distance after said new pass condition has been met.

11. The method of claim 9 , wherein said step of determining whether a pass completion condition has been met includes:

storing a first direction of the implement while the implement is applying said crop input;

determining that the implement has been lifted;

determining that the implement has been lowered;

determining a second direction of the implement after the implement has been lowered;

comparing a change between said second direction and said first direction to a threshold; and

storing a pass completion determination if said change exceeds said threshold.

12. The method of claim 6 , further including:

determining a set of threshold distances from said marker location to a headland along a set of travel directions, said headland defining an implement-width boundary bordering the field;

comparing a location of the implement to said marker location;

determining that the implement has crossed the marker location;

determining the travel direction of the implement after crossing the marker location; and

determining that the implement has traveled a threshold distance corresponding to said travel direction.

13. The method of claim 12 , further including:

defining a terminal edge of said plot region by the ordered steps of:

determining whether a pass completion condition has been met;

terminating application at said plot application rate after said new pass condition has been met; and

resuming application according to said prescription map after said new pass condition has been met.

14. The method of claim 13 , wherein said step of determining whether a pass completion condition has been met includes:

determining whether the implement has been applying said crop input over a threshold distance after said new pass condition has been met.

15. The method of claim 12 , further including:

determining a likely implement travel direction at the marker location;

determining a threshold distance from said marker location to a headland along said likely travel direction, said headland defining an implement-width boundary bordering the field;

determining that the implement has crossed the marker location;

determining the travel direction of the implement after crossing the marker location; and

determining that the implement has traveled a threshold distance corresponding to said travel direction.