It’s interesting the variations around the country, whilst this year our yields are fairly solid, they are not as good as last years.Poly N has made no difference to spec weights here, 80-84 kg in Wheat, SB 72kg
I think it’s more to do with wall to wall sunshine during grain fill coupled with a moisture retentive soil that can sustain it
But it is a big part of where the yield comes from, this years Barley is similar to last years wheats !!