Calibrating the small seeds box

This article provides general instructions on calibrating the Agrowdrill small seeds box. It is suitable for small seeds boxes purchased separately or mounted to non-Agrowplow machines. 

For small seeds boxes mounted to an Agrowdrill machine, refer to the operators manual for your seed drill. 

 

General Instructions

Ensure the small seeds box is being driven at the correct number of turns per 1,000m described in the rate chart below. 

Make sure the seed box drive is turning counter-clockwise when looking at the sprocket. 

Small seeds boxes are designed to sow seeds smaller than wheat or oats. The feed rollers will crack if the seeds are too large. 

You should always clean out your seed box and store it inside a shed when it is not in use. 

small seeds box sprocket rotation

 

Rate chart

To achieve the desired kilograms per hectare the small seeds box must be driven at the following number of turns per 1,000m.

Row spacings Turns per 1,000m
  Low rate High rate
100mm 17 67
125mm 22 84
150mm 26 100
175mm 31 118
200mm 35 135
225mm 40 151
250mm 44 168

Calibration Guides

When the shaft is turning at the correct number of rotations per 1,000m, use the following charts to help calibrate the small seeds box. 

Low rate calibration guide (kg per ha)

SSB calibration graph - low gear

  Calibration Setting
  1 2 3 4 5 6 7 8 9
Red clover 0.9 1.9 2.8 3.8 4.7 5.7 6.6 7.6 8.5
Lucerne 0.9 1.8 2.7 3.6 4.4 5.3 6.2 7.1 8
Sub clover 0.8 1.6 2.3 3.1 3.9 4.7 5.4 6.2 7
Canola 0.7 1.3 2.0 2.7 3.3 4.0 4.7 5.3 6
Phalaris 0.6 1.3 1.9 2.5 3.2 3.8 4.4 5.1 5.7
Ryegrass 0.3 0.7 1.0 1.3 1.7 2.0 2.3 2.7 3

 

High rate calibration guide (kg per ha)

SSB calibration graph - high gear

  Calibration Setting
  1 2 3 4 5 6 7 8 9
Red clover 3.4 6.9 10.3 13.8 17.2 20.7 24.1 27.6 31.0
Lucerne 3.3 6.7 10.0 13.3 16.7 20.0 23.3 26.7 30.0
Sub clover 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0
Canola 2.6 5.1 7.7 10.2 12.8 15.3 17.9 20.4 23.0
Phalaris 2.3 4.7 7.0 9.3 11.7 14.0 16.3 18.7 21.0
Ryegrass 1.3 2.7 4.0 5.3 6.7 8.0 9.3 10.7 12.0