Its called super start, only available in Ireland. 40% can 60% urea.That's interesting, I've been debating to go with AN or urea ?
I like the AN for quick availability but urea is less likely to leach and in my opinion matches the crop needs better. My thinking is if it's cold the plant won't need it and the urea won't get converted but as the soil warms the plant grows and the rate of conversion of the urea increases.
I've only got a small area osr which imo needs its N first.so I did wonder about going over it twice with 1/2 cwt of AN and 1/2 cwt urea. I'm not sure how it would spread if I could mix it.