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Effect of Corn-Induced Shading and Temperature on Rate of Leaf Appearance in Redroot Pigweed (Amaranthus retroflexus L.)

Published online by Cambridge University Press:  12 June 2017

Stephane M. Mclachlan ,
Clarence J. Swanton ,
Stephan F. Weise  and
Matthijs Tollenaar
Stephane M. Mclachlan
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, N1G 2W1, Canada
Clarence J. Swanton
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, N1G 2W1, Canada
Stephan F. Weise
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, N1G 2W1, Canada
Matthijs Tollenaar
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, N1G 2W1, Canada
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Abstract

Leaf development and expansion are important factors in determining the outcome of crop-weed interference. The comparative effects of temperature and corn canopy-induced shading on the rate of leaf appearance (RLA) of redroot pigweed were quantified in this study. Growth cabinet results indicated a linear increase in RLA with increased temperature. Weed RLA was predicted utilizing both this function and field temperature data. The ratio of observed to predicted RLA of redroot pigweed grown in field experiments decreased in 1990 and 1991 as shading increased with increased corn density and delayed weed planting date. Results indicated that RLA is substantially affected by canopy-induced shading in addition to temperature.

Keywords

Redroot pigweed, Amaranthus retroflexus L. # AMAREcorn, Zea mays L., ‘Pioneer 3902’wheat, Triticum aestivum L.barley, Hordeum vulgare L.PhenologyirradiancelightsimulationAMARE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 590 - 593
Copyright
Copyright © 1994 by the Weed Science Society of America 

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