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Yellow nutsedge (Cyperus esculentus) interference in simulated sweetpotato plant beds

Published online by Cambridge University Press:  13 April 2020

Stephen L. Meyers*
Affiliation:
Associate Extension/Research Professor, North Mississippi Research and Extension Center–Pontotoc Ridge-Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, USA; current: Assistant Professor, Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, USA
T. Casey Barickman
Affiliation:
Assistant Research Professor, North Mississippi Research and Extension Center–Horticultural Unit, Mississippi State University, Verona, MS, USA
Jeffrey L. Main
Affiliation:
Research Associate, North Mississippi Research and Extension Center–Pontotoc Ridge-Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, USA
Thomas Horgan
Affiliation:
Senior Research Associate, North Mississippi Research and Extension Center–Horticultural Unit, Mississippi State University, Verona, MS, USA
*
Author for correspondence: Stephen L. Meyers, Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN47907. (Email: slmeyers@purdue.edu)

Abstract

Greenhouse experiments were conducted in 2016 at Pontotoc and Verona, MS. On March 3 (Pontotoc) and March 7 (Verona), landscape fabric was placed in the bottom of polyethylene lugs, each 0.22 m2, then approximately 5 cm of a 1:1 (v/v) blend of soilless potting media and masonry sand was added. ‘Beauregard’ sweetpotato [Ipomoea batatas (L). Lam.] storage roots weighing between 85 and 227 g, and several with emerging sprouts ≤1 cm, were placed longitudinally in a single layer on the substrate, then covered with an additional 3 cm of the substrate. Sprouted yellow nutsedge (Cyperus esculentus L.) tubers were transplanted equidistantly into sweetpotato-containing lugs at six densities: 0, 18, 36, 73, 109, and 145 m−2. Trials were terminated 55 and 60 d after planting at Pontotoc and Verona, respectively. Predicted total sweetpotato stem cuttings (slips) decreased linearly from 399 to 312 m−2 as C. esculentus density increased from 0 to 145 m−2. Predicted total slip dry weight at a C. esculentus density of 145 m−2 was reduced 21% compared with 0 m−2. Predicted rotten sweetpotato storage roots increased from 2.6 to 11.3 m−2 as C. esculentus density increased from 0 to 145 m−2. In response to increasing C. esculentus density, sweetpotato seed roots exhibited increased proximal-end dominance.

Type
Research Article
Copyright
© Weed Science Society of America, 2020

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Footnotes

Associate Editor: Ramon G. Leon, North Carolina State University

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