Thank you for sharing this very interesting picture with all of us!
This is by far the most advanced use of a 2-wheel tractor that I have ever seen - and a very expensive one too! One needs to do a lot of seeding to justify this implement, and I would not like to be the one who have to tell my wife, that I just ordered one for my BCS
The seeder is produced in northern Italy by the company "Agricola Italiana", and here is a link to their seeder model M-815-SN:
The seeder is described as a "pneumatic precision seed drill for vegetables", and it is especially designed for use in greenhouses. The seeder seems to have a front-mounted compressor feeding the pneumatic system, and axel-extensions mechanically connected to the large center roller. This way the normal gearbox is used for propulsion.
The axel-extensions are more easily seen on this picture: