N rate (kg N ha−1)

Mean Plant N Concentration (%)

Parma

Ashton

Rupert

0

0.33c

0.35b

0.33c

84

0.41bc

0.39ab

0.41bc

168

0.65a

0.45a

0.65a

252

0.49b

0.35b

0.49b

336

0.70a

0.45a

0.70a