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Timing Weed Removal in Field Pea (Pisum sativum)

Published online by Cambridge University Press:  20 January 2017

K. Neil Harker ,
Robert E. Blackshaw  and
George W. Clayton
K. Neil Harker*
Affiliation:
Agriculture and Agri-Food Canada, Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB T4L 1W1
Robert E. Blackshaw
Affiliation:
Lethbridge Research Centre, Box 3000 Main Postal Station, Lethbridge, AB T1J 4B1
George W. Clayton
Affiliation:
Lacombe Research Centre, 6000 C & E Trail, Lacombe, AB T4L 1W1 Contribution 941
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted in 1996, 1997, and 1998 at Lacombe and Lethbridge, AB, to determine the influence of early weed competition on field pea yields. Wild oat and Tartary buckwheat were removed from plots at weekly intervals after pea emergence by hand-weeding and maintained weed-free for the remainder of the growing season. Tartary buckwheat produced slightly more biomass than wild oat at Lacombe, whereas wild oat produced much more biomass than Tartary buckwheat at Lethbridge. Weed-free pea yields at Lacombe were always two- to threefold higher than at Lethbridge. At Lethbridge, early competition with Tartary buckwheat in all years, and with wild oat in 1998, did not reduce pea yields. In 1996 and 1997 at Lethbridge, pea yield reductions due to wild oat began at 2 wk after pea emergence; for the next 2 wk yield loss was linear, decreasing at an average rate of 97 kg/ha per day. Early weed competition led to pea yield losses at Lacombe in all 3 yr. The onset of yield loss at Lacombe over the 3-yr period ranged from 1 to 2 wk after pea emergence; for the next 2 to 3 wk yield loss was linear, decreasing at an average rate of 45 kg/ha per day. Yield losses after full-season weed competition ranged from 40 to 70% at both sites. Usually, the beginning of the critical weed-free period was at 1 or 2 wk after pea emergence. Optimum pea yields usually required weed removal very early in the pea life cycle; weed removal beyond 2 wk after pea emergence often protected only suboptimal yields.

Keywords

Wild oat, Avena fatua L. #3 AVEFATartary buckwheat, Fagopyrum tataricum (L.) J. Gaertnpea, Pisum sativum L. CarreraCritical weed-free periodcrop-weed interferenceduration of competitionAVEFAPOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 15 , Issue 2 , June 2001 , pp. 277 - 283
Copyright
Copyright © Weed Science Society of America 

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