Great Plains 3P806NT Material Rate - Manual (Page 32)

30 3P806NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
151-143B Table of Contents Main Box Rates 2011-10-21
Adjusting for Density
The fertilizer meter rate charts are based on fertilizer with
a density of 65 pounds per cubic foot (1.04 kg/liter). If
your fertilizer density is within a few percent of that, you
can skip this step and rely on calibration to determine
final Rate Adjuster setup.
For larger variances, particularly with very low densities,
pre-compensating can simplify calibration, by choosing a
different target chart value for the application rate.
Density Conversion Charts
U.S. Customary Units
Metric
1. Find your actual material density. Normally, this
reported on the container in which it was supplied. If
not, weigh a known volume and calculate it.
2. Find your material Density in the table at right, and
the Conversion Factor below it.
3. Adjust your target application rate prior to consulting
the Fertilizer Rate Chart.
4. Consult the Fertilizer Rate Chart for the Adjusted
rate.
5. Calibrate using the Rate Adjuster setting for the
adjusted rate.
Density, lb/ft
3 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0
Conversion Factor 1.45 1.30 1.20 1.10 1.00 0.93 0.87 0.81
Density, kg/liter 725 800 875 950 1041 1125 1200 1275
Conversion Factor 1.44 1.30 1.19 1.10 1.00 0.93 0.87 0.82
Example: You want to apply 109 pounds per acre.
TargetRate = 109
Example: Your fertilizer has a density of 45 pounds per
cubic foot.
ConversionFactor = 1.45 (from chart)
Adjusted Rate = 158 pounds per acre
Example: The adjusted rate is 158. The closest chart
rate of 157 corresponds to a Rate Adjuster setting of:
60
158 109 1.45 × =
AdjustedRate TargetRate ConversionFactor
Ч
=