Seed-hawk TOOLBAR 2008 Manuel d'utilisateur télécharger pdf (Page 49)

OPERATION

LOOSE SOIL CONDITIONS

If the soil is too loose before seeding, the final packed surface will be

excessively below the loose soil that is thrown to the sides. This increases the

likelihood of soil falling, blowing or washing back into the packer tire path. The

result is an altered seed depth. The solution to this is to ensure that the soil is

not too loose before seeding. It may be necessary to pack the soil before

seeding.

The Seed Hawk Drill will throw soil if:

x The row centers are too close.

x The soil is conventionally tilled leaving it loose.

x Straw and/or chaff is poorly spread, wet or in large clumps.

x Field travel speed is excessive. May affect above listed items.

MUDDY SOIL CONDITIONS

Seeding depth may be altered if mud sticks to the packer tire. If mud is only

0.25 - 0.38 in (6 - 10 mm) thick, then this is not usually a concern. Assuming

good soil moisture, the reduced seed depth is still adequate. Air-inflated packer

tires should be deflated slightly to allow the tire to bulge slightly and shed any

mud build up. If the mud thickness is uniform, the seed depth, also, will be

uniform, but shallower than the initial depth setting. It may be desirable to set

the seed depth deeper to compensate for mud build up.

OPERATING ON CURVES AND CORNERS

When seeding around curves and corners the packer wheel moves out of the

furrow and rides up on the hard, undisturbed furrow shoulders. Packing force is

concentrated more so on the shoulder and the packing on the seedbed is

reduced. In addition to reduced packing action, fertilizer placement is also

adversely affected. Optimum performance, of course, is seeding in a straight

path as much as possible.

LOW PACKER TIRE PRESSURE

For packer tires that are air inflated: if the packing forces are high and the tire

pressure is low, effective packing action is reduced. The tire widens and rides

harder on the furrow shoulders. This can be corrected by increasing tire

pressure and/or reducing downward packing force.

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Seed-hawk TOOLBAR 2008 Manuel d'utilisateur Page 49