Field setup 10 GreenSeeker setup
For best results, use the RT200 to "read" the NRS and apply N at growth stages dependent
upon the crop algorithm used. For most supplied algorithms this is typically:
ll Wheat: Feekes growth stage 4-6
l
Corn: V8-V12
For updated specific algorithm instructions, see www.GreenSeeker.com. Plant coverage should
be at least 50% for the sensors to accurately determine NDVI for topdressing (or sidedressing).
To collect sensor readings, pass the boom mounted sensor (or handheld sensor) over the crop
at 32 -– 48" above the canopy. Sense a large area of the NRS and nonreference portion of the
field to accurately determine their respective NDVI values.
3. Apply an applicators width swath of N. The rate of N applied should be high enough to satisfy
crop N needs in a good year.
4. Enter the values into GreenSeeker on the FM-1000 integrated display:
ll Automatically with the boom mounted sensors
l Manually with the GreenSeeker handheld
5.
If the response is variable across the field, select an area where the difference between the
reference and the non-reference areas are most apparent. This assures that the algorithm will
determine a rate that utilizes the highest yield potential prediction and maximum response to
N for that year.
To estimate yield potential, most algorithms utilize an environmental factor (Growing Degree
Days or Days From Planting), which takes into account the weather and length of time that has
passed since planting.
Different GDD variations are used for different crops. You must know the planting date and
sensing date to obtain the GDD value.
Field setup
To prepare a reference area, do the following:
1.
Make certain to use a permanent land marker or temporary marker to ensure that the NRS can
easily be found later in the season. You may also want to establish the location of the NRS by
noting it as an A-B line or flag on the FM-1000 integrated display.
The ideal NRS would run the length of the field, but it should at least be 400 feet long.
2. At appropriate crop growth stage, take readings of the NRS and an adjacent part of the field yet
to be fertilized. For most supplied algorithms the following is typical:
ll Wheat: Feekes growth stage 4-6
l Corn: V8-V12.
3. Find the area where the nitrogen rich strip is most apparent in comparison to the rest of the
field (this indicates greatest potential for the crop).
246 FM-1000 Integrated Display User Guide Version 9.25, Revision B
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