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Survey of Winter Wheat (Triticum aestivum) Stubble Fields Sprayed with Herbicides in 1998: Cultural Practices

Published online by Cambridge University Press:  20 January 2017

Gail A. Wicks ,
Don H. Popken ,
Garold W. Mahnken ,
Gordon E. Hanson  and
Drew J. Lyon
Gail A. Wicks*
Affiliation:
Department of Agronomy, University of Nebraska, North Platte, NE 69101
Don H. Popken
Affiliation:
United Suppliers Inc., North Platte, NE 69101
Garold W. Mahnken
Affiliation:
University of Nebraska, North Platte, NE 69101
Gordon E. Hanson
Affiliation:
University of Nebraska, North Platte, NE 69101
Drew J. Lyon
Affiliation:
Department of Agronomy, University of Nebraska, Scottsbluff, NE 69361
*
Corresponding author's E-mail: [email protected]
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Abstract

A survey of 174 fields was conducted during August and September of 1998 to investigate effects of cultural and herbicide practices on postharvest weed control in winter wheat stubble fields across western and southern Nebraska. Seventy-four percent of the fields were seeded at rates of 67 to 100 kg/ha, with 60% of the wheat seeded in rows spaced 25 cm apart. Wheat seeded in east–west rows contained 98% more stinkgrass and 82% more tumble pigweed than wheat seeded in north–south rows. Sixty-nine percent of winter wheat stubble fields were rated excellent for weed control. Postharvest weed control with herbicides was not affected by row spacing. In western Nebraska, density of tumble pigweed and Russian thistle was greater when wheat seeding rate was 50 kg/ha than at higher seeding rates. Short-stature winter wheat cultivars had greater densities of Pennsylvania smartweed and toothed spurge than taller cultivars. The most common winter wheat cultivars were ‘Arapahoe’ (34%) and ‘Alliance’ (17%). Weed control was positively correlated with number of winter wheat stems per square meter (r = 0.22∗∗). Density of several weed species was greater in fields seeded with a disk than with a hoe drill. The most common crop rotations sampled were winter wheat–corn–fallow (50%), winter wheat–fallow (18%), and winter wheat–corn–soybean (13%). Winter wheat yields and wheat stem densities were greater and weed density was less when winter wheat was seeded after an 11- to 14-mo fallow period rather than a 0- to 5-mo period.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. # SETVIkochia, Kochia scoparia (L.) Schrad. # KCHSCPennsylvania smartweed, Polygoncum pensylvanicum P. # POLPYRussian thistle, Salsola iberica Sennen & Pau # SASKRstinkgrass, Eragrostis cilianensis (All.) E. Mosher # ERACNtoothed spurge, Euphorbia dentata Michx. # EPHDEtumble pigweed, Amaranthus albus L. # AMAALcorn, Zea mays L.soybean, Glycine max (L.) Merrwinter wheat, Triticum aestivum L.Atrazinecrop rotationsecofallowecofarmingglyphosateno-tillweed managementW–C or Sor, winter wheat–corn or sorghumW–C–F, winter wheat–corn–fallowW–C–Soy, winter wheat–corn–soybeanW–C–Spgr, winter wheat–corn–spring grainsW–F, winter wheat–fallowW–W, winter wheat–winter wheat
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 467 - 474
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Publication 13601 University of Nebraska Agricultural Research Division Journal Series.

References

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