Seed-hawk TOOLBAR 2009 Manuel d'utilisateur télécharger pdf (Page 35)

Seed Hawk Manual Tool Bar Page 32

4.8 PRIMARY OPERATION VARIABLES

Packing

Positive soil to seed contact is essential for optimum seed

germination. Soil type, extent of tillage or disruption and moisture

content all influence germination percentages. There are six primary

variables that affect the quality of soil packing:

 Packer Tire Pressure

 Field Travel Speed

 Packing and Trip Pressure

 Cornering

 Furrow Depth and Width

 Knife Lateral Separation

4.8.1 Packer Tire Pressure

Ensure that the packer tires are inflated to the appropriate pressure.

Foam filled packer tires do not, of course, require air pressure

adjustment.

4.8.2 Field Travel Speed

Select a field travel speed that will allow productivity, but will not

compromise accurate seed and fertilizer placement. Higher field

travel speeds tend to cause excessive soil disturbance and can throw

soil into adjacent furrows resulting in deeper seed depths. Higher

field travel speeds also reduce the effect of soil packing by reducing

packing pressure.

4.8.3 Packing and Trip Pressure

Determining and setting effective packing and shank trip pressure

allows for optimum seed germination rates. Setting the packing and

trip pressure too high may result in: more rocks being pulled out of

the ground, higher wear on shanks and opener parts, excessive

packing pressure and less tripping in harder soils.

4.8.4 PACKING AND TRIP PRESSURE TIPS:

 It may be desirable to further increase packing and trip pressure in drier,

sandier soils.

 Higher packing and trip pressures can result in more rocks being pulled out

of the soil.

 Higher wear on opener parts may be experienced with higher pressure.

 Soil packing will be more firm with higher packing and trip pressure.

A reduction in shank tripping action will be experienced in firmer soil conditions.

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Seed-hawk TOOLBAR 2009 Manuel d'utilisateur Page 35