Ageratum conyzoides is one of exotic weeds in South China and Southeast Asia. The allelopathic potential of A. conyzoides is one of the reasons that it becomes a dominant and widespread weed in managed ecosystems. However, in some specific agroecosystems, both the allelopathic potential and fertility of A. conyzoides residue can be beneficial to crops. In order to investigate allelopathic effects of A. conyzoides residue on peanut and related weeds in the field, treatments both mixed the resid...