Great Plains NP4000B Operator Manual - Manual (Page 99)

2014-05-14 Table of Contents Index 417-199M
Great Plains Manufacturing, Inc. Table of Contents Index 95
Fertilizer Rates
Anhydrous Fertilizer Rate
Rate setting for anhydrous ammonia is controlled entirely
by the console. For the Raven SCS 450 available from
Great Plains, see page 44.
Conventional Liquid Fertilizer Rate
Rate setting is materially different for each pump type:
• Ground Drive: rate is positively set by the drive system
and piston pump dial.
• Hydraulic Drive: rate is set on the console.
The console operates a flow control valve. The valve
adjusts the rate up to the peak value available at the
current setting for hydraulic pump rpm.
Make adjustments to orifice plates to provide back-
pressure, keeping the boom within a specific safe
pressure range that assures consistent delivery.
Rate Setting Steps:
1. Determine the rate (below).
2. Install suitable orifice plates (page 100).
3. Check strainer screen size (page 102).
4. Ground Drive: Set the ground drive Range
(page 103), and ground drive dial (page 104).
Hydraulic Drive: Set the pump pressure (page 105);
set the desired rate on the console (see
016-0159-831 Raven SCS 450 Installation,
Operation and Service manual).
5. Check the manifold pressure and relief valve during
operation (page 103).
Determining Application Rate
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
the chart.
If your target rate is weight per area, you need to know
the material density to convert it to liquid volume
measure:
If you want to use the slide chart, and have only a metric
rate value, convert it to U.S.customary units:
Ground Drive:
The tables, and web calculator provided expect rates to
be expressed as
[U.S.customary] gallons per [U.S.Survey] acre or
liters per hectare.
The slide chart provided is gal/ac only.
Volume_per_Area Weight_per_Area Density ÷
=
Gallons_per_Acre 0.107 Liters_per_Hectare Ч
=