3.2. Yield and biomass production in 2006
There were no significant effects of fungicide, variety or nitrogen on vegetative biomass in 2006. Mean biomass was 6.22 t ha− 1. The effect on grain yield of the interaction between variety and N application rate was significant (P < 0.05) in 2006. Grain yield was the highest in Ellison, and in HM with fungicide treatment ( Fig. 3). Yield was reduced in HM without fungicide treatment, and was lowest in Baxter. Fungicide treatment had negligible effect on yield in Baxter. There was a highly significant (P < 0.001) effect of N on yield, with yield increasing as N increased. There were no significant interactions between N and other factors. There was a highly significant (P < 0.001) effect of variety on harvest index, with Baxter (0.39) having a lower harvest index than HM (0.43) or Ellison (0.44). The effects of other factors and interactions on harvest index were not significant.