5. Adjust Equipment To Preserve Residue |
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How you operate your machinery and the attachments you use has
a significant impact on residue cover. In most cases, for example,
if you till shallow at a slow speed, you leave more residue on the
surface than if you till deeply at a fast speed.
You can also see a big difference among the three most common ground-engaging
components attached to the standards of a chisel plow—sweeps,
spikes, or twisted shovels. Sweeps leave the most residue on the soil
surface, followed by chisel spikes, and then twisted shovels. |
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To
preserve more residue with either an offset disk or a tandem disk,
operate blades at a small angle and only as deep as necessary to perform
the desired tillage and residue cutting. Spherical blades leave more
residue on the soil surface than conical blades. |
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When
there is a choice between a field cultivator and a disk for secondary
tillage, the cultivator will tend to bury less residue. |
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Rippers
are similar to chisel plows, but they generally leave more residue.
The farther apart you space the standards, the more surface residue
you preserve. Also, narrower points will bury less residue than wide
points. |
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The
set-up for different combination tools can vary considerably. To preserve
the most residue, select the least aggressive attachments, set the
disk blades to a shallow depth, and space the sweeps as wide as practical.
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On
planters, fluted coulters bury the most residue, followed by rippled
and bubble coulters. Smooth coulters preserve the most residue. |
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Row-cleaning
attachments are typically used when planting a crop in heavy residue.
If you use row cleaners, adjust them to move only residue—not
soil. Also, take care not to create a furrow with your row cleaner.
A furrow provides a place for water to accumulate, increasing the
risk of soil crusting and runoff that will wash out seeds, soil, and
plants. |
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