Great Plains 1007NT Operator Manual - Manual (Page 28)

24 1007NT Great Plains Manufacturing, Inc.
150-290M 10/06/2010
Material Rates Overview
Details of seed and fertilizer rate setting are found in the
Seed Rate Manual, and rely on data from that manual.
Rate setting controls are different for each box, but inde-
pendent for each box. Some boxes have more than one
control.
Basic rate settings are found in the Seed Rate Manual
(part number 150-290B, normally located in the manual
pak enclosure at front center of drill).
All chart rates, for all boxes, are approximate. Great
Plains strongly recommends calibration of each box to
the material to be applied.
Seeding Depth Overview
Setting nominal planting depth, and achieving it consis-
tently, is affected by multiple adjustable drill functions,
which can interact. From greatest to least effect they are:
Refer to Figure 12
Main Box Native Grass Small Seeds Fertilizer
Rate Range Seed Rate Reduction
Rate Handle Rate Knob Coarse Rate Drive Type Drive Type
Fine Rate Rate Handle Driver/Driven
Cup Adjustment Door Handle
Coulter Depth (page 29)
The coulters prepare the soil ahead of the openers,
and are typically set slightly deeper than the openers.
The openers thus only need to open the tilled shaft
into a V-shaped furrow.
The openers cannot generally run deeper than the
coulters, and running them too close to coulter depth
may result in uneven seed depth.
Opener Depth (Press Wheel Height) (page 37)
Using the T-handle, in no-till conditions, opener depth
can be set near, and at any level above coulter depth.
In soft or conventionally tilled soil, the opener disc
depth is more independent of the coulters.
Row Unit Down Pressure (Spring) (page 36)
In most conditions, the factory spring setting is suffi-
cient to make a consistent furrow in the coulter-pre-
pared soil. In extremely heavy conditions, with the
coulters running at the desired depth, the openers
may be making a furrow of inconsistent depth. Rather
than increase the coulter depth, you can increase
opener down force at the row unit springs.
Disc Blade Adjustments (as blades wear) (page 35)
As blades wear, the diameter of the discs, and their
contact gap, changes. Seeding depth will also change
(or become irregular), unless adjustments are made
to blade spacing and the T-handle setting. Generally,
the blades need to be replaced completely before
coulter height adjustments would be needed.
Never back up with openers in the ground. To do so may cause
damage or opener plugging.
Figure 12
07 Series Coulter & Row Unit
28466
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