Mean (±standard error) plant frequency of Ranunculus acris (A–C), Lathyrus pratensis (D–F), Vicia sepium (G–I), and Rumex acetosa (J–L) per plot and treatment in June2010, 2011, and 2012; replicates per treatment = 8. Asterisks indicate significant differences from the control,*p < 0.05,**p < 0.01,***p < 0.001 (Nested analysis of variance with permutations [nested PerAnova]); p values Bonferroni corrected. C = control, I = insecticide, F = fertilizer, H = herbicide