Wheat School: How to avoid leaf burn from UAN

Achieving big wheat yields means managing nitrogen, but split applications can damage wheat leaves.
Peter "Wheat Pete" Johnson is hopping mad in this Wheat School episode - mad at himself that is. In the video, he's standing in a wheat field with leaf-burn - a field that he said was good-to-go.
"Split your nitrogen, because we've got a big wheat crop in the ground and we want to make sure we keep it standing; we don't want it to fall over," says Johnson. However, low temperature nights, cloudy days, and the fact that the leaves don't have a cuticle, can cause horrible leaf burn from 28 per cent (UAN) on a second application, he explains.
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[@lovetofly32]

Man Im the 6th viewer! 😄 Our wheat is heading out here in kansas. Looks gooood!😁

[@Boostertee]

Watching from Zimbabwe, my wheat now at tillering stage.....

[@wholelover]

Even after splitting nitrogen, i got the dreaded burns. But i saw the weeds were dead, finished, and the wheat couldn't look better in terms of yield potential

[@oldfartonabmx2122]

So your UAN over there is 28%? Ours here in Australia is about 42. No wonder I burned our wheat! And it sounds like your intention is to not get any on leaf - no leaf absorption? I’ve been trying for leaf absorption.
👍

[@WheatPete]

We dilute UAN to 28% so it does not salt out under cold temperatures. My guess is your UAN is 32%, I believe that is as high as you can get into solution. We use 32% UAN in season when it won't be stored over winter. Spraying straight 28% or 32% right on the leaf with fine droplets (herbicide nozzles) will definitely burn the leaves. Very little N is absorbed through the leaf regardless, roots have evolved to take up N, not leaves. Even when a safer N source is applied in a foliar application, at least 90% is washed off the leaves and taken up by the roots in most studies that have looked at this.

[@oldfartonabmx2122]

@@WheatPete thanks. EasyN is 42.5% total N. 👍

[@WheatPete]

@@oldfartonabmx2122 Brochure shows 42.5% weight per volume. 32% weight per weight. 32% is all that can dissolve on a weight per weight basis. Fertilizer nitrogen is always reported on a weight per weight basis here. Not sure in Australia.

[@oldfartonabmx2122]

@@WheatPete yeah it’s weight volume

[@oldfartonabmx2122]

@@WheatPete I see now, 42% w/v, 32%w/w.