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Duration of Tartary Buckwheat (Fagopyrum tataricum) Interference in Several Crops

Published online by Cambridge University Press:  12 June 2017

E. Ann De St. Remy  and
P. Ashley O'Sullivan
E. Ann De St. Remy
Affiliation:
Agric. Canada Res. Stn., Box 1420, Lacombe, Alberta, TOC 1SO
P. Ashley O'Sullivan
Affiliation:
Agric. Canada Res. Stn., Box 1420, Lacombe, Alberta, TOC 1SO
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Abstract

Field studies were conducted over a 7-yr period at Lacombe, Alberta, to study the relationship between the duration of Tartary buckwheat interference [Fagopyrum tatarium (L.) Gaertn. # FAGTA] and yield of barley (Hordeum vulgare L.), oats (Avena sativa L.), wheat (Triticum aestivum L.), flax (Linum usitatissimum L.), and rapeseed (Brassica campestris L.). The data were pooled over years and analyzed by multiple regression. The equations were as follows: ŷ = 15.46 + 0.39X1 + 0.00x2 −0.11x3 (barley), ŷ = −15.44 + 0.49x1 + 0.02x2 + 0.08x3 (oats), ŷ = −2.04 + 0.39X1 + 0.05x2-0.03x3 (wheat), ŷ = −4.38 + 1.14x1 −0.04x2 + 0.01x3 (flax), and ŷ = −13.85 + 0.40x1 – 0.01x2 + 0.04x3 (rapeseed); where ŷ was the estimated percent yield loss of the crop, x1 was the duration (days) of the Tartary buckwheat in the crop, x2 was the number of Tartary buckwheat plants/m2, and x3 was the number of crop plants/m2. The time that Tartary buckwheat remains in the crop contributed most to the yield loss observed in all crops. Yield loss between 0.4 and 1.1% per day was attributed to this variable alone. For a given x1, x2, and x3 value the order of percent yield loss was flax>oats>wheat> barley>rapeseed.

Keywords

Yield loss equationsAvena sativaBrassica campestrisLinum usitatissimumHordeum vulgareTriticum aestivumFAGTA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 2 , March 1986 , pp. 281 - 286
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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