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Season-Long Interference of Yellow Nutsedge (Cyperus esculentus) with Direct-Seeded and Transplanted Watermelon (Citrullus lanatus)

Published online by Cambridge University Press:  20 January 2017

Richard S. Buker III ,
W. M. Stall ,
S. M. Olson  and
D. G. Schilling
Richard S. Buker III*
Affiliation:
Horticultural Sciences Department, University of Florida, Citrus Research and Education Center, Lake Alfred, FL 33850-2299
W. M. Stall
Affiliation:
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611
S. M. Olson
Affiliation:
Horticultural Sciences Department, University of Florida, North Florida Research and Education Center, Quincy, FL 32351
D. G. Schilling
Affiliation:
Agronomy Department, University of Florida, Central Florida Research and Education Center, Apopka, FL
*
Corresponding author's E-mail: rsb@lal.ufl.edu
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Abstract

Field studies were conducted in the spring of 1997 and 1998 to quantify the effect of season-long yellow nutsedge interference on watermelon yield. The competitive ability of watermelon with yellow nutsedge was compared in two establishment methods (watermelon transplanted and direct seeded). Critical yellow nutsedge densities and the biological threshold (BT) were used to characterize the competitive ability of watermelon. The critical density in both direct-seeded and transplanted watermelons was 2 yellow nutsedge plants/m2. The BT of yellow nutsedge in seeded watermelons was 37 yellow nutsedge plants/m2, whereas the BT in transplanted watermelons was 25 plants/m2. Transplanting watermelons did not improve their competitive ability with yellow nutsedge. Percent yield loss was similar for both establishment methods at the respective yellow nutsedge densities. Over 40% yield loss was incurred with 12 yellow nutsedge plants/m2 for both establishment methods. Furthermore, it was concluded that watermelons are poor competitors with yellow nutsedge.

Keywords

Yellow nutsedge, Cyperus esculentus L. #3 CYPESwatermelon, Citrullus lanatus LAdditive designcompetitioncrop establishmentBT, biological threshold
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 751 - 754
Copyright
Copyright © Weed Science Society of America 

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References

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