Abstract
In field plots, Japanese millet [Echinochloa crus-galli(L.) Beauv. var.frumentacea(Link) W. F. Wight] competed strongly with yellow nutsedge (Cyperus esculentusL.), reducing its dry weight and the number of plants and tubers with no loss of dry weight to the millet. Because Japanese millet did not shade the nutsedge for more than half the day, the main competition was thought to be ‘root’ competition (nutrient and water) with light competition as a minor factor. The greenhouse studies verified that roots were the primary area of competition. However, light competition between the two species was stronger in the greenhouse than in field plots. Also, when confined to limited light and soil volumes with a 1-month growing period, Japanese millet was reduced in dry weight by nutsedge competition.
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