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Effect of nitrogen fertilization on vegetative development and morphology of R and S blackgrass phenotypes. (A) Tiller length and (B) number of tillers, assessed non-destructively during plant establishment and vegetative growth. (C) Aboveground biomass, (D) root biomass, (E) total leaf area, and (F) specific leaf area were assessed destructively after 72 days growth. Solid lines show the fitted relationship, with shaded regions representing the 95% prediction interval.
