Great Plains 1007NT Material Rate - Manual (Page 35)

07/08/2009 150-290B
Great Plains Mfg., Inc.
33
Fertilizer Rate Charts
Fertilizer Rate Calibration
Differences will exist between the tested fertilizer and
field conditions used to generate the Rate Chart, and
your fertilizer and conditions. To accurately achieve your
target application, Great Plains recommends calibrating.
Before completing these steps, review “Calibration
Overview” on page 2, and adjust for density (previous
page)
6. Estimate the sample sizes, based on 1 ⁄
10
th acre or
1 ⁄
10
th hectare (the “10” below). If using an altered row
spacing, or different number of containers, replace
the “15” and “3” in the equations.
4. To perform this calibration, you need a scale that is
accurate near the aggregate sample size, and 3
light-weight containers, each capable of holding a
row’s sample.
Example: You want to apply 109 pounds per acre
with your 1007NT-1575 drill.
RateSample is:
10.9 = 109
÷ 10
Example: you are using all 15 rows.
SamplePerRow is;
0.73 = 10.9
÷ 15
Example: 3 rows are to be used in the sampling.
ExpectedSample is:
2.18 lbs = 0.73 x 3
RateSample
FieldRate
10
a
---------------------------
=
SamplePerRow
RateSample
15
b
--------------------------------
=
ExpectedSample SamplePerRow 3
c ×
=
a. Using 1/10th acre or 1/10th hectare.
b. Using all 15 rows. Otherwise use actual row count in use.
c. Using 3 sample rows. Otherwise use actual count.
Example: 3 containers, each weighing 0.5 lb.
ContainersWeight is:
1.5 lb = 0.5 x 3