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Rate setting overview, Setting planting rate, Setting fertilizer rate – Great Plains YP2425A Material Rate User Manual

Page 4: Population reference information, Kernels per pound, Seeds per unit, Seed spacing, Seeds per unit seed spacing

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401-626B

Table of Contents Metric Charts

2012-02-29

2

YP2425A

Table of Contents Metric Charts

Great Plains Manufacturing, Inc.

Rate Setting Overview

Setting Planting Rate

There are five or six steps to obtaining the desired
number of seeds per acre, depending on row
configuration. This data applies to the Air-Pro

®

meter

when planting at one

a

seed per disc cell.

1.

For your crop, determine your intended population, in
seeds/acre or seeds/hectare. If you know only the
seed spacing or pounds/acre (kg/hectare), consult
the charts on page 2 through page 4.

2.

For your crop, population and desired field speed,
verify the suitability and setup of your seed disk:
See “Air-Pro® Meter Disk Selection” on page 5.

3.

Set initial seed inlet shutter per seed rate chart.
Set initial meter pressurization per page 8, 9.

4.

Sprocket index for staggered twin-row
Twin-row planters, with certain crops, get maximum
benefit with precise seed spacing between adjacent
rows. See “Indexing Fine Adjustment” on page 25.

5.

Set meter rate
This is done via the seed monitor. Once data about
your planter is entered, you select the seed rate
directly. Consult the manual for the seed monitor.

6.

Check planting rate
See “Checking Planting Rate” on page 10.

Setting Fertilizer Rate

If your planter is equipped with one or both optional
fertilizer manifold systems, it does not include the tank.

If the planter has a Type 2

b

(formerly referred to as a

“starter”) manifold, it may rely on an off-planter pump, or
may use one or two ground drive pumps on the planter.

See “Ground Drive Fertilizer Rate” on page 42 for
ground drive pump configuration.

If the planter has a Type 3

b

(formerly referred to as a

“hi rate”) manifold, it relies on an off-planter pump,
typically the pump on a Great Plains PFC1600 or
PFC2000 tank cart.

Rate setting for the cart pump is found in the cart’s
Operator manual.

Rate is controlled by the pump. Consistent distribution
requires using the correct size orifices in the manifolds. If
the orifice size is too large, flow may not be even across
all rows. If the orifice size is too small, material may be
dumped at the relief valve.

See “Fertilizer Rate” on page 39 for orifice information.

Population Reference Information

Seeds Per Unit

If only pounds/acre (kilograms/hectare) is known, obtain
the population count by multiplying the weight by the
“Kernels per pound” value from the seed container.

Seed Spacing

If only seed spacing is known, use the tables on the next
five pages to determine population.

a. Volumetric planting (more than one seed per cell), is not

covered by this manual.

b. Type 2 and Type 3 are described in the YP2425A

Operator manual, under Setup topic “Fertilizer
Connections
”.

Example: Milo
Target rate:

4.5 pounds/acre

Seed density:

14500 seeds/pound

Population:

= Rate

× Density

= 4.5

× 14500, or:

65250 seeds/acre

Kernels Per Pound

80,000 Seed

Kernels

80,000 Seed

Kernels

Bag Weight

per Pound

Bag Weight

per Pound

67.5 lbs

1,185

45.0 lbs

1,778

65.0 lbs

1,231

42.5 lbs

1,882

62.5 lbs

1,280

40.0 lbs

2,000

60.0 lbs

1,333

37.5 lbs

2,133

57.5 lbs

1,391

35.0 lbs

2,286

55.0 lbs

1,455

32.5 lbs

2,462

52.5 lbs

1,524

30.0 lbs

2,667

50.0 lbs

1,600

27.5 lbs

2,909

47.5 lbs

1,684

25.0 lbs

3,200

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