Fertilizer meter rate, Fertilizer rate chart – Great Plains 2000 Operator Manual User Manual
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Section 3 Adjustments
12, 15 and 20 Foot Series Three-Point Drills 118-389M-A
2012-03-27
Great Plains Mfg., Inc.
Fertilizer Meter Rate
Fertilizer application rates will vary with fertilizer type, den-
sity and particle size. Relative humidity and field condi-
tions can also affect application rates. The chart on this
page is based on material with a density of 65 pounds per
cubic foot (1.04 kg/L) and average particle size. Initially set
the rate according to the charts, then calibrate the drill to
your material as described below.
If your drill has two boxes, remember to repeat the follow-
ing steps for each drill box.
1.
Raise the drill with the tractor hydraulics so the drive
wheels are off the ground. Rotate the drive wheels to
see that the metering system is working properly and
free from foreign material.
2.
From the chart, find the setting number for your row
spacing and desired application rate. Rotate the gate
adjustment knob to the number obtained from the
chart.
3.
Check that your gauge-wheel tires are the correct size
(9.5L x 15 for 12- and 15-foot drills and 11L x 15 for 20-
foot drills) and properly inflated. Refer to Tire Inflation
Chart, “Appendix,” on page 39.
Fertilizer Rate Chart
(pounds per acre)
Density Conversion Chart
The fertilizer meter rate charts are based on fertilizer with a density of 65 pounds per cubic foot (1.04 kilograms per liter).
If you are applying fertilizer of a different density, use the following table to convert application rate.
Example: Your fertilizer has a density of 75 pounds per cubic foot, and you want to apply 100 pounds per acre. Multiply
the desired application rate by the conversion factor.
100 x 0.87 = 87
Adjust drill to the setting closest to 87 pounds per acre.
Setting number
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Ro
w
Spacing
6"
13
25
48
67
89
112
131
154
173
197
218
234
261
279
292
303
306
308
7"
13
23
41
57
78
95
111
131
148
165
184
199
221
235
246
256
259
261
7.5"
11
20
38
54
72
89
105
123
138
157
174
187
209
223
234
242
245
247
8"
11
20
36
50
69
84
98
115
130
146
163
176
195
207
219
226
228
231
10"
8
16
29
40
54
67
79
92
104
118
131
140
157
167
175
182
183
185
Density, lb/ft
3
(kg/l)
45.0 (0.72)
50.0 (0.80)
55.0 (0.88)
60.0 (0.96)
65.0 (1.04)
70.0 (1.12)
75.0 (0.87)
80.0 (0.81)
Conversion Factor
1.45
1.30
1.20
1.10
1.00
0.93
0.87
0.81
IMPORTANT: The fertilizer rate chart is for granular
fertilizer with a density of 65 pounds per cubic foot
(1.04 kg/L). If you are applying fertilizer with a different
density, use the density conversion chart.
4.
Record the weight of an empty container large enough
to hold the fertilizer metered for one acre.
5.
Place several pounds of fertilizer over three fertilizer
feed cups on the outside end of the drill box. Pull the
fertilizer tubes off of these three openers.
6.
Turn the gauge wheels a few turns to fill the feed cups
with material. Continue to turn until fertilizer drops to
the ground from all three tubes.
7.
Place a container under the three tubes to gather me-
tered fertilizer.
8.
Turn the gauge wheel until for one acre (450 tire rota-
tions on a 12-foot drill, 364 on a 15-foot drill or 283 ro-
tations on a 20-foot drill). Check that the three feed
cups have plenty of fertilizer coming into them.
9.
Weigh the metered material. Subtract the initial weight
of the empty container. Divide by three. Multiply by the
number of openers on your drill to determine total
pounds-per-acre metered. If this figure is different
than desired, reset adjustment knob accordingly.
NOTE: You may want to repeat the calibration procedure if
your results vary greatly from the chart.
10. When drilling, check the rate by noting acres drilled,
amount of fertilizer added to drill and level of material
in drill box. If you are applying more or less than de-
sired, adjust the metering rate slightly to compensate
for field conditions.