Great Plains 1007NT Material Rate - Manual (Page 34)

Great Plains Mfg., Inc.
32
150-290B 07/08/2009
Fertilizer Rates
Setting Fertilizer Rate
The model 1007NT fertilizer meters are driven indepen-
dently of all seed meter drives, and are unaffected by
Drive Type, and Main box/Small Seeds rate settings. Fer-
tilizer rate is adjusted with the Rate Adjuster at the fertil-
izer box.
Fertilizer application rates vary with fertilizer type, den-
sity and particle size. Relative humidity and field condi-
tions can also affect application rates. Initially set rate
according to charts, then calibrate the drill to your mate-
rial as described on this page.
Accurately obtaining the desired application rate requires
three steps:
1. Adjusting target rate for large differences between
material and chart density.
2. setting the Rate Adjuster to the scale value
from the chart, and;
3. calibration: checking predicted application rate, and
resetting rate adjuster as needed.
Adjusting for Density
The fertilizer meter rate chart is based on fertilizer with
average particle size and 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 to step 4 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.
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 (or unadjusted rate, if no density correction was
required).
5. Set the Rate Adjuster to the chart value.
Figure 12
Fertilizer Rate Adjuster
27256
1
2
1 2
Density: lbs/cu-ft
(kg/liter)
45.0
(0.72)
50.0
(0.80)
55.0
(0.88)
60.0
(0.96)
Conversion Factor 1.45 1.30 1.20 1.10
Density: lbs/cu-ft
(kg/liter)
65.0
(1.04)
70.0
(1.12)
75.0
(1.20)
80.0
(1.28)
Conversion Factor 1.00 0.93 0.87 0.81
Example: Your fertilizer has a density of 45 pounds per
cubic foot, and you want to apply 109 pounds per acre.
Example: for the adjusted 158 rate, the closest chart
rate is:
157
which corresponds to a Rate Adjuster setting of:
60
158 109 1.45 × =
AdjustedRate TargetRate ConversionFactor Ч
=