To repeat trials from 2004 to confirm confidence in findings that UAN can be used as an in-crop fertiliser in Victoria.

Best practice for using UAN at rates of up to 60L/ha when mixed with herbicides and fungicides:

• if using herbicides or fungicides not in this trial then always to a 'jar' test first for determining the physical compatibility: if white clouds or clear divisions appear, then the two may not be compatible;
• herbicides and fungicides mix better with UAN if mixed in water first;
• do not spray at temperatures over 25degrees C especially after flag leaf emergence because you don't want to scorch the flag leaf (!)
• do not spray when the Delta T is < 2, it appears that the leaf scorch is worst when humidity levels are high.