Fig. 5

Root length of winter wheat seedlings (cv. Isengrain) of different treatments 14 days after seeding in the diameter range 0.0–0.2 mm and 0.2–0.4 mm. Data show average treatment values of four independent replicates. Treatment letters were as follows: Cont = pure soil without glyphosate, Gly = glyphosate 6 L dose without biochar amendment, ch5% = biochar amendment of 5%, gly6L + ch1% = glyphosate with biochar amendment of 1%, Gly6L + ch2.5% = glyphosate with biochar amendment of 2.5%, Gly6L + ch5% = glyphosate with biochar amendment of 5%, and gly6L + ch10% = glyphosate with biochar amendment of 10%. Error bars indicating standard error. Different letters above the bars indicating significant differences (α = 0.05)