Granular inoculants including solid core granules typically have low application rates in addition to a low bulk density. This makes granular inoculants different than many other products applied through an air seeder. We have compiled the following metering guidelines from Bourgault to assist growers when applying solid core granules:
Bourgault 2000, 3000, 4000 series tanks
• These models use a quick change sprocket to vary the speed of the auger and the rate – if the operator is not able to set the rate low enough with the sprocket that they have – reduce the “cultivator sizing sprocket” this will slow the overall speed of the main drive and reduce the application rate.
Bourgault 5000,6000 series tanks (variable speed transmission)
• When conducting an initial calibration a transmission setting of between 13 and 26 in low range is appropriate. Actual setting will depend on application rate of product.
• If the operator is at the lowest end of the setting (below 10) after inputting calibration number from initial calibration, increase the drive ratio on the range sprockets to again reduce the speed the auger can be turned therefore requiring transmission to be set at a higher speed. Optimal transmission setting is between 30-50 however between 15 and 85 is acceptable for smooth operation.
Bourgault 7000 series tanks (hydraulic drive)
• The calibration number for the low output auger for solid core granules is 0.065 lbs per revolution.
• These units have the PDM Pro metering augers that have a UHMW flighting and UHMW lined housing – an ultra-low rate auger will be available in this configuration allowing for low rates to be easily obtained.
For further information, contact your local Bourgault dealer.