Is that easy to draw conclusions nitrogen recovery? The fertilizer industry likes to draw nice “precision” conclusions about the relationship between yield and N rate, however the evidence accumulated over many years suggests that relationship is far from precise, indeed it is very variable, not least because yield is grain rather than total vegetative growth.Well, it varies a lot. 11.5 from 220 as a second cereal is really good nitrogen efficiency. I get the higher tons of grain / n from the oats but then have to put it back on for the wheat. Certainly we don't get the rooting when drilling in late October compared to late September. So more on. Any excess turns to protein anyway which we get paid for. I'd say for us after oats I'd be happy with 25kgN per ton of wheat as feed.
Sept drilled after grass a totally different kettle of fish.
I my estimation our crops here aren’t likely to need any extra n I put on. I do have a ton of fert in the shed so I could complete the planned dressing on a trial patch.