The fitted curves were used to predict how much N would
be returned in grain protein for each unit of N added as
fertiliser (Fig. 8). In 2006, the proportion of fertiliser N returned
as grain N was much lower in the no-fungicide treatment at
all levels of N. In 2007, there was no appreciable difference in
N return between fungicide and no-fungicide treatments at
low levels of N, with slightly higher N return in the fungicide
treatment at N levels above 200 kg ha−1.