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Population dynamics of yellow nutsedge (Cyperus esculentus) in cropping systems in the southeastern coastal plain

Published online by Cambridge University Press:  12 June 2017

W. Carroll Johnson III  and
B. G. Mullinix Jr.
B. G. Mullinix Jr.
Affiliation:
Coastal Plain Experiment Station, Tifton, GA 37193-0748
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Abstract

Studies were conducted from 1990 through 1994 near Tifton, GA, on the population dynamics of yellow nutsedge and certain annual weeds in peanut—corn and peanut—cotton rotations. Converse rotation sequences were included to eliminate year effects. Continuous fallow plots (noncrop) were included for comparison. Within each crop, including fallow, were 3 levels of weed management: low, moderate, and intensive. Weed densities and numbers of yellow nutsedge tubers were not affected by crop rotations, but they were affected by individual crops and weed management systems in each crop. Fallow plots, including those with intensive fallow weed management using tillage and nonselective herbicides, consistently contained more yellow nutsedge plants and tubers than other plots. Moderate and intensive weed control systems in peanut and cotton reduced yellow nutsedge densities and tubers, but only peanut yields were increased by intensive weed management. Weed management systems did not affect yellow nutsedge densities in corn, although yields were increased by moderate and intensive systems due to improved control of other weeds. Our results suggest that uninterrupted plantings of peanut, corn, or cotton with moderate levels of weed management are generally sufficient to suppress yellow nutsedge and allow for optimum crop yield. If fields are fallow, yellow nutsedge population densities and tubers will increase exponentially, even with intensive fallow weed management.

Keywords

Crop rotationscultural weed controlfallow weed managementgroundnutmaizeRCHSCIAQTADIGSPPANTECYPESFlorida pusley, Richardia scabra L. RCHSCsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. IAQTAsouthern crabgrass, Digitaria ciliaris (Rett.) Koel. DIGSPTexas panicum, Panicum texanum Buckl. PANTEyellow nutsedge, Cyperus esculentus L. CYPEScorn, Zea mays L.cotton, Gossypium hirsutum L.peanut, Arachis hypogaea L.
Type
Weed Management
Information
Weed Science , Volume 45 , Issue 1 , February 1997 , pp. 166 - 171
Copyright
Copyright © 1997 by the Weed Science Society of America 

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