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Broccoli (Brassica oleracea var. botrytis) Yield Loss from Italian Ryegrass (Lolium perenne) Interference

Published online by Cambridge University Press:  12 June 2017

Carl E. Bell
Carl E. Bell*
Affiliation:
Coop. Ext., Univ. Calif., Holtville, CA 92250
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Abstract

Italian ryegrass interference in broccoli was measured in field experiments and the data fit a rectangular hyperbolic competition model. The model predicted 58% of broccoli yield loss related to Italian ryegrass density when pooled over three y. An economic threshold value of 4.9 Italian ryegrass plants m−1 of crop row was determined to be the density required to cause a 3.6% yield loss, equal to postemergence weed control costs. Italian ryegrass densities of 600 to 1000 plants m1 of broccoli row caused 100% yield loss.

Keywords

Italian ryegrass, Lolium perenne L. #3 LOLPEbroccoli, Brassica oleracea L. var. botrytis LRectangular hyperbola modeleconomic thresholdeconomic optimum thresholdLOLPE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 117 - 120
Copyright
Copyright © 1995 by the Weed Science Society of America 

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