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Alfalfa (Medicago sativa) Seed Yield Loss Due to Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  12 June 2017

James R. Moyer
Affiliation:
Agric. Can. Res. Stn., Lethbridge, AB, Canada T1J 4B1
G. Bruce Schaalje
Affiliation:
Agric. Can. Res. Stn., Lethbridge, AB, Canada T1J 4B1
Peter Bergen
Affiliation:
Alberta Sugar Company, Taber, AB, Canada T0K 2G0

Abstract

Alfalfa seed yield and Canada thistle densities were measured in 10 fields in southern Alberta to assess the effect of thistles on seed yield. Thistle density and seed yield from each field were fitted to the Weibull, hyperbolic, and linear equations and a random coefficient and linear equation were used to obtain an “average yield loss curve”. Estimated average losses in alfalfa seed yield were >34% and >48% at thistle densities of 10 and 20 shoots m–2, respectively.

Type
Research
Copyright
Copyright © 1990 by the Weed Science Society of America 

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