Hi Davide
The weed you have in your field is named “Rye Grass” or Lolium Multiflorum.
It´s a very common weed in barley or wheat crops, here in South América.
You could control it on field with Pinoxaden + Cloquintocet-mexyl (AXIAL - Commercial product of Syngenta).
Now, your best solution is to...
Hi arzaman, great proyect!
How are you thinking to separate the grain´s roots at the final of the process?
The same machine will allow it, with another speed?
rgrds
Mauricio