FIGURE 2 Plant densities and features of S. alterni fl ora in different treatment groups at different times. (A) Density of S. alterni fl ora . (B) Density of seedlings. (C) Density of fl ower spikelet. (D) Height of S. alterni fl ora . (E) Length of fl ower spikelet. (F) Length of leaves. (G) Width of leaves. (H) Diameter of stem. The different lowercase letters indicate signi fi cant differences between groups (p < 0.05). Red symbols and lines show plots treated with a high concentration of imazapyr, green symbols and lines show low concentration plots, blue symbols and lines show untreated control