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Influence of purple nutsedge (Cyperus rotundus) density and nitrogen rate on radish (Raphanus sativus) yield

Published online by Cambridge University Press:  12 June 2017

Bielinski M. Santos ,
Jose P. Morales-Payan ,
William M. Stall  and
Thomas A. Bewick
Jose P. Morales-Payan
Affiliation:
Horticultural Science Department, University of Florida, Gainesville, FL 32611
William M. Stall
Affiliation:
Horticultural Science Department, University of Florida, Gainesville, FL 32611
Thomas A. Bewick
Affiliation:
Horticultural Science Department, University of Florida, Gainesville, FL 32611
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Abstract

Greenhouse and field experiments were conducted to determine the effects of nitrogen (N) supply and purple nutsedge population densities on the yield of radish. In the greenhouse studies, additive series with purple nutsedge densities of 0, 50, 100, 200 or 350 plants m−2 were established. Nitrogen rates of 0, 110, 220, or 330 kg ha−1 were provided to the potting medium. A significant density by N interaction was found for radish fresh weight. Within a given nutsedge density, radish yield decreased as N rate increased. In field studies, additive series of 0, 50, 100, 150, or 200 nutsedge plants m−2 were established the same day radish was sown. Nitrogen rates were 100 or 200 kg ha−1. Marketable radish yield losses and nutsedge shoot dry weight and height were determined 30 d after seeding the crop. Nutsedge densities and N rates interactively influenced radish root yield. Radish yield loss reached 100% at nutsedge densities of 75 and 125 plants m−2 at 200 and 100 kg N ha−1, respectively. Purple nutsedge produced larger shoot biomass as N increased from 100 to 200 kg ha−1. Results of both greenhouse and field studies showed that as N increased, the negative effect of the weed on the crop was enhanced.

Keywords

Radish, Raphanus sativus L.purple nutsedge, Cyperus rotundus L. CYPRONutrient competitionaddition seriesnutsedge interferencenitrogenCYPRO
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 6 , December 1998 , pp. 661 - 664
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

Current address: c/o Lynx Air DR-SD, P.O. Box 407052, Fort Lauderdale, FL 33340

References

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