I would be putting manganese on that if I really could. Maybe some phos-star as well. Some warm weather should see it turn a corner.
Yup. Slosh of mineral and some pgr to keep it tillering and green it up. But not for a good few days after rolling.
I wouldn't PGR a crop that was that distressed, better to wait and put it on in March with T0. I'd be doing manganese and magnesium +/- phostar 7 days after rolling. I would also pray the weather warms up!