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Simulation of Chenopodium album seedling emergence

Published online by Cambridge University Press:  20 January 2017

Erivelton S. Roman ,
Stephen D. Murphy  and
Clarence J. Swanton
Erivelton S. Roman
Affiliation:
Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada N1G 2W1
Stephen D. Murphy
Affiliation:
Department of Environmental and Resource Studies, University of Waterloo, Waterloo, ON, Canada N2L 3G1
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Abstract

Studies were conducted to develop a model from field and laboratory studies to predict the emergence phenology of Chenopodium album. A mechanistic model to predict the phenology of weed seedling emergence across locations, years, and tillage systems is presented. This was accomplished by the integration of hydrothermal time to describe germination and thermal time to describe shoot elongation. The interaction of soil moisture and temperature in the model was accounted for by the integration of hydrothermal time in algorithms predicting seed germination. Soil temperatures within the weed seed germination zone were predicted by temperature ranges at different depths in the soil. Emergence phenology of C. album seedlings was predicted with greater accuracy under no-till and moldboard plow systems than under a chisel plow system. We attributed this lower accuracy in the chisel plow system to increased heterogeneity in the soil matrix and vertical distribution of the seedbank caused by the chisel plow. The presence or absence of Zea mays did not affect model performance. The use of soil temperature to calculate thermal time was a better predictor of C. album seedling emergence than air temperature. The ability to predict weed seedling emergence phenology is an important component of an integrated weed management strategy.

Keywords

Chenopodium album L. CHEAL, common lambsquartersHydrothermal timemodelingsoil moisturesoil temperatureCHEAL
Type
Research Article
Information
Weed Science , Volume 48 , Issue 2 , April 2000 , pp. 217 - 224
Copyright
Copyright © Weed Science Society of America 

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