10 GreenSeeker setup Field preparations for user defined rate
4. Take sensor readings with RT200 or Hand Held sensor for input to your selected Crop
Algorithm.
5. Be sure to match nozzles and/or rate control system to maximize response time and
performance for each field's requirements.
For more information, see Field preparations for nitrogen application (page 245) for more details,
and be sure to consult your application equipment and rate control systems manuals as applicable.
Field preparations for user defined rate
The RT200 system can be used to apply other materials than nitrogen. GreenSeeker permits a
custom algorithm to be entered (which is a table of product values) instead of the NDVI value. These
values are entered into the Custom Formula Application table. See Create a custom table (page
408).
Note – The grower/consultant must develop these rates. Also be aware of the rate range ability of your
specific rate controller and nozzles used to achieve these results.
Field calibration
You can use a GreenSeeker hand-held to measure the NDVI of a crop if you know the approximate
desired rate for the crop.
Note – You can also measure NDVI using the GreenSeeker RT200 by observing NDVI values on the
GreenSeeker panel or by using the calibration function.
Delivery system and liquid control
As with any variable rate system, the minimum and maximum rates obtainable are dependent upon
the delivery system. The RT200 interface module is capable of "requesting" any rate, but the actual
rates delivered are dependent upon the rate controller and its components. Most liquid rate control
systems control or "throttle" the pressure of the system to affect flow and application rate.
When using the RT200 with a typical liquid delivery system, match nozzle sizes to expected delivery
rates. After the appropriate reference strip readings, GDD, and selection of crop type are input into
RT Commander, the application graph can be accessed to show the prescription rates at various
sensor NDVI readings. Depending upon what delivery system is used, there will be actual minimum
and maximum rates obtainable. These rates depend on components such as the pump, control
valve, nozzles, and boom plumbing sizes.
GreenSeeker has features that allow for minimum and maximum rates to be set, regardless of the
crop algorithm prescription. After a nozzle set is chosen, the minimum should be set at the lowest
rate the nozzles will still give adequate pattern/performance. Maximum rates may be limited by
rates that lessen atomization or drift.
Version 9.25, Revision B FM-1000 Integrated Display User Guide 247
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