Great Plains
| 401-647M | 2019-06-11
Table of Contents
Index
68
3PYPA
Table of Contents
Index
Adjustments
Liquid Fertilizer Adjustments (Option)
If installed there are two adjustments for the Great
Plains-provisioned components:
1. Row orifice setup
Orifice plate sizes are chosen to assure consistent
pressure at all nozzles. Refer to the Seed Rate
manual.
2. Relief valve setting
See “
Fertilizer Row Shut-Off
” on page 69.
Great Plains recommends checking with your local
agronomist as soil conditions vary. Soil conditions in your
area may need less or more fertilizer than represented in
these charts. In furrow, do not exceed 12 gallons per
acre in any case.
The liquid fertilizer system is designed to operate
(ideally) between 15 and 40 psi, but in no case more
than 65 psi. Several system elements affect system
pressure, and need initial setup, periodic maintenance,
and adjustment when changing fertilizer rates.
Fertilizer Orifice Plates
Refer to Figure 78
To install, insert the plate inside the gasket supplied
with the nozzle . Insert the gasketed plate with the
legend side facing out the nozzle outlet (typically up).
In general, the orifice
needs to be small enough to
create at least 15 psi of pressure in the manifold to
operate the check valves but large enough to prevent
the manifold pressure from exceeding 65 psi.
The minimum pressure is required to even out the flow of
fertilizer between rows. To reduce orifice plugging and
pump wear, use the largest orifice practical for your
fertilizer application rate. Alternate orifice plates are
listed in the Seed Rate manual.
The best pressure range to maintain is 20 to 40 psi to
ensure optimum distribution while minimizing leakage.
Built-in check valves at the row units prevent flow below
15 psi.
The Seed Rate Chart book for this planter (manual part
number 401-647B) contains a table of orifice sizes in
gallons per acre.
System Damage/Uneven Application Risks:
Select orifice plates to balance flow. Sizes too small can result
in system rupture. Sizes too large can result in unbalanced
flow. Orifice plates do not set fertilizer rate. Rate is set at the
pump. Plates only create back-pressure to balance flow.
Agricultural Chemical Hazards:
Avoid contact with skin or eyes. Wear proper protective
equipment as required by chemical manufacturer. Avoid
prolonged breathing of chemical fumes. Wear respirator as
required by chemical manufacturer.Some chemicals will cause
serious burns, lung damage, and death. Seek medical
assistance immediately if accident occurs. Know what to do in
case of accident.
Figure 78
Fertilizer Drop Line Shutoff
29984
Agricultural Chemical Hazard:
Wear protective gloves when exchanging nozzles and caps.
1
3
2
4
5
1
2
3
1
4
