Allelochemicals from sorghum [Sorghum bicolor (L.) Moench] residues may inhibit the emergence and growth of other crops. We examined effects two landraces, IS9456, a high sorgoleone producer, IS22320, zero producer. Residues were applied at 7.2 g, 14.4 g 21.6 kg-1 soil. Emergence maize (Zea mays L.), wheat (Triticum aestivum L.) soybean [Glycine max Merr.] tested in three glasshouse pot experim...