I'm not familiar with that setup, but are you running single or double shoot?
If double, then you probably need restrictors in the primary seed lines. A heavy rate of fertilizer puts back pressure on the fertilizer primary lines, while 5 lb of canola creates very little restriction in the seed lines. If the tank is pressurised from the fan (looking at pictures it appears to be?), air will want to flow out the tank, through the meters to the path of least resistance, and this would be the seed lines.
The more fan RPM you use, the pressure difference becomes greater between the restricted and unrestricted lines, so the airflow and rate changes differ more
If single shoot, forget what I just said
If double, then you probably need restrictors in the primary seed lines. A heavy rate of fertilizer puts back pressure on the fertilizer primary lines, while 5 lb of canola creates very little restriction in the seed lines. If the tank is pressurised from the fan (looking at pictures it appears to be?), air will want to flow out the tank, through the meters to the path of least resistance, and this would be the seed lines.
The more fan RPM you use, the pressure difference becomes greater between the restricted and unrestricted lines, so the airflow and rate changes differ more
If single shoot, forget what I just said
