Check Seed Population

  1. NOTE: When planting with little depth and with the closing wheels raised, the seeds tend to roll or jump. This will affect the precision of seed spacing.

    CQ283995
    CQ283995-UN-15MAR10

    A - Chain Anchor Points

    B - Depth Peg

    Attach a short chain from the indicated points (A) to one or more sets of closing wheels so that the seed furrow remains open.

    NOTE: Spring tension must be relieved to carry out check. See "Adjusting Pressure of Closing Wheels" in this manual.


  2. Adjust depth adjustment peg (B) two settings from minimum.

  3. Plant over a short distance and check to see if seeds are visible in furrow. Adjust depth adjustment peg, if necessary.

  4. Plant an area selected from the table below so as to obtain a sufficiently significant area to check the seed population.

    Distance to be Planted to Carry Out Population Check

    Row Width

    40 cm

    45 cm

    50 cm

    70 cm

    80 cm

    90 cm

    Distance to be Planted

    25 m

    22 m

    20 m

    15 m

    12.5 m

    11 m

  5. A39155
    A39155-UN-13FEB96

    A - Marker

    B - Seeds

    Mark out the distance planted with markers (A).


  6. NOTE: When planting with little depth and with the closing wheels raised, the seeds tend to roll or jump. This will affect the precision of seed spacing.

    Count the seeds (B) between the markers.

If checks in the field indicate that the machine is planting at a rate significantly different to that indicated in the seed transmission rate tables, then perform the following troubleshooting sequence in the given order:

  1. Check that ALL of the transmission drive wheels are in accordance with the setting defined in the rates table.
  2. An excessive number of blockages in the unit may result in a low population and reduced spacing control. Increase the pressure of the unit or drive machine more slowly in order to reduce excessive blockages.
  3. Check that slip of the machine's drive wheels is close to normal. Crop residue, tire inflation pressure, ground conditions and pressure of unit can all cause variations to the slip rate of the drive wheels.

ONLY FOR VACUUM METER:

If all settings are correct and the population is very high, the vacuum level can be reduced in increments of one inch until the correct population is reached. If the real population is very low, the vacuum level can be increased by half to one inch jumps until the correct population is reached.

ML70882,0000479-19-20100315