266 Firmware Version 5.2
• Min Rate (shown at Crop Sensor Setup)
The lowest amount of N that should be applied.
• N
Refers to Nitrogen being applied.
• N Algorithm
The OptRx Crop Sensor Module uses an N algorithm to calculate an N rate through a Sufficiency Index
reading.
• Rate Increment (shown at Crop Sensor Setup)
An optional increment that the display can use to round the N rate applied, if the operator desires. For
example, if the operator enters the number 5 and the display is applying a rate of 27, the number will be
rounded to 25.
• Rate Offset (shown at Crop Setup screen)
Modifies the applied rate in the event of significant field stresses during a season, such as drought
conditions; or to make adjustments because of soil type.
• Reference Strip
The healthiest portion of your field where you are satisfied that N is sufficient. This allows a baseline of
optimum crop performance that the system can compare against other cropland.
• Reflectance
The light reading of the plant measured by individual light spectral wavelength. The comparison of different
reflectance values can be used to determine the health of the plant.
• VI
Vegetation Index. The recorded value from remote sensing that displays a comparison of crop vigor and
biomass of the scanned plant. This value, which is taken from a reference scan of a Reference Strip, uses
a ratio that indicates the health of the plant. NDVI and NDRE are examples of different vegetation indexes.
• VI Minimum (shown at Settings screen)
The threshold below which the Crop Sensor applies the minimum rate. This setting is used to apply a
minimum amount of N on ground with damaged or diseased crops.
• VI Reference (shown at Settings screen)
The value of a healthy crop biomass used in reference for calculating the proper N application rate. The VI
Reference value is determined by the creation of a Reference Strip.
• VI Zero (shown at Settings screen)
The threshold below which the Crop Sensor applies a zero rate. This setting is used to prevent applying N
over bare ground or permanently damaged crops.
NDVI Normalized Difference Vegetation Index =
Near Infared Reflective - Red Reflective
Near Infared Reflective + Red Reflective
NDRE Normalized Difference Red Edge =
Near Infared Reflective - Red Edge Reflective
Near Infared Reflective + Red Edge Reflective
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