Influence of nitrogen on competition between purple nutsedge, maize and soybean
2002
A:PS
Details
Title
Influence of nitrogen on competition between purple nutsedge, maize and soybean
Publication Date
2002
Call Number
A:PS
Summary
The divided box technique in an additive design was used to study the relative roles of shoot and root competition between purple nutsedge (Cyperus rotundus), maize, and soyabean as influenced by different levels of nitrogen fertilizer application. 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 soyabean. Nitrogen fertilization significantly increased maize and nutsedge height, leaf area, and biomass. However, soyabean height, leaf area, and biomass were not significantly influenced by nitrogen. Competitive balance indices of either mixture were not significantly influenced by nitrogen fertilizer application. 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.
Journal Citation
v.48(1):73-79, INTERNATIONAL JOURNAL OF PEST MANAGEMENT
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles