Does the air pressure blowing down the seed tube ever have to be adjusted for different speeds or seed sizes? Is it just the same air that is holding the seed to the disc or a separate supply and psi level.
Yes, you have to adjust the air pressure regarding the TKW (thousand kernel weight), you can regulate it from 2.5 to 4 kpa depends on the TKW, heavier seeds needs more pressure. And there is only one fan that blow the seeds so, this means that the same airflow and pressure that holds the seed on disk, will blow the seed too.
