What he's using in there is a Landini l55 hotbulb tractor (I do love italian tractors but I have never seen one of those in the flesh)
and that landini l55 does 55 horsepower (a bit larger than the np super, I think).
What the operator does is pretty clever, beacuse what I've found out is that he would raise the hydraulics and then adjust the toplink so that the large plough would still remain in the soil even when the hydraulics are raised.
On watching the most recent videos with that particular tractor joining in, what the operator does was that drop the plough, and then when the plough reaches the desired depth (as far as I know 50-60 cm.), he will raise the hydraulics, adjust the toplink, and remain like that until the end of the furrow.
![Very Happy :D](./images/smilies/icon_biggrin.gif)