Abstract
The length of the seminal root (SR) axis and the number and length of lateral roots (LRs) of sorghum (Sorghum bicolor Moench) were markedly inhibited by taro [Colocasia esculenta (L.) Schott] residues incorporated into a sand growing medium. The sand profile was divided equally into zones with and without residues. Production and elongation of the first-order LRs of the SR axis facing the zone containing taro residues were severely suppressed. On the side facing the zone that was free of residues, production and elongation of LRs was not inhibited. SR and LR growth was drastically impaired and many plants were killed when taro residues were incorporated in large amounts into the uppermost 2 cm of the growing medium. The activity of the allelopathic substances in the root zone appeared to be location-specific.
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