Checking Seed Population

1. Attach chain (B) to one or more sets of closing wheels so they will allow the seed trench to remain open.

2. Set the depth adjusting handle (A) two settings from the minimum setting as shown.

3. Plant a short distance and check to see if seeds are visible in the trench. Readjust depth adjusting handle if necessary.

4. Plant approximately 90 m (100 yd).

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5. Consult the charts and determine what distance equals 1/1000 of a hectare, 1/100 of an acre, or

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6. Mark distance selected with flags (A).

7. Count the seeds (B) between flags.

8. If you marked off 1/100 of an acre, multiply the number of seeds counted by 100.

If you marked off 1/200 of an acre, multiply the number of seeds counted by 200.

NOTE: When planting at a shallow depth with the closing wheels raised, seeds may tend to roll or bounce. This will affect seed spacing accuracy.

If in-field checks indicate that the planter is planting at a rate significantly different than the seed transmission rate chart indicates, investigate the following in the order listed:

Ensure that ALL transmission sprockets are set according to the rate chart.

Excessive unit bounce can cause low population and reduce spacing control. Reduce excessive unit bounce by increasing unit down force, or drive slower.

Ensure that the planter drive wheel slippage is close to normal. Variations in drive wheel slippage can be caused by crop residue, tire inflation pressure, soil conditions and unit down force. The amount of tire slippage can be checked by measuring the rolling circumference of the drive tire as follows:

Attach a marker, such as a chain or rubber strap, to the tire. Measure the distance between the marks left by the tire when operating at planting speed. The average of five measurements should be within the following ranges:

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If your average measured rolling circumference does not fall within these ranges and the tire pressure is adjusted correctly, the seed transmission can be adjusted to compensate for the slippage. Use a transmission setting that results in the desired population.

FOR CORN SEED PLANTING ONLY (VACUUM METER)

If all other settings are correct and if the population is too high, the vacuum level can be reduced in one inch increments until the correct population is achieved. If the actual population is too low, the vacuum level can be increased in one inch increments until the correct population is achieved.

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