Abstract
The divided box technique in an additive design was used to study the relative roles of shoot and root competition between purple nutsedge, maize and soybean as influenced by different levels of nitrogen fertilization. Measures of resource complimentarity and the relative aggressivity indicated that during the early stages of growth, shoot competition was important to both crops and purple nutsedge probably due to the rapid establishment rate of purple nutsedge. Root competition for soil resources was more severe than competition for aerial resources in retarding the growth of maize and soybean. Nitrogen fertilization significantly increased maize and nutsedge height, leaf area and biomass. However, soybean height, leaf area and biomass were not significantly influenced by nitrogen. Competitive balance indices of either mixture were not significantly influenced by nitrogen fertilization. The effects of full (shoot + root) competition were more dramatic than the effects of either shoot or root competition operating independently. Purple nutsedge was the aggressor in resource acquisition.
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