S Barley, How long between rolling and Manganese?

[Grass And Grain]

As per title. How many days gap do you recommend from rolling to applying manganese sulphate. (Presume there's no frost forecast)

Spring barley, emerged about 10 days, then had a sniff of Mn, then 7 days gap, then rolled. Now wanting to put more manganese on.

 

[Agriimark]

7-10 days

 

[Grass And Grain]

7-10 days

Was thinking should be 7+ days. Currently day 4 after rolling, and leaves looking bruised.