WGTA = Dry matter production, initial harvest. 2 HGTA = Height of tallest flowering culm, initial harvest. 3 NFLC = Number of flowering culms, initial harvest. 4LTIL = Length of longest leaf, 3 weeks after initial harvest. ' NTIL = Number of surviving tillers, 3 weeks after initial harvest. 6WGTB = Dry matter production, 25 weeks after initial harvest.