Since ancient times, farmers have identified the importance of incorporating crop residues to enhance crop yields. Soil incorporation or surface application of allelopathic crop residues affects weed dynamics by reducing/delaying the seed germination and establishment, in addition to suppressing individual plant growth resulting in an overall decline in the density and vigour of the weed community (Gallandt et al., 1999). The decomposition of allelopathic crop residues produces a variety of phytotoxins in the soil causing adverse effects on other plants (Nelson, 1996). Therefore, allelopathic crop residues can be exploited for weed suppression, and can thus be helpful in reducing reliance on herbicides (Weston, 1996).