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Influence of Small Grain Crops on Weeds and Ecofallow Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Gail A. Wicks ,
Garold W. Mahnken  and
Gordon E. Hanson
Gail A. Wicks
Affiliation:
Univ. Nebraska, Dep. Agron., West Cent. Res. and Ext. Ctr., North Platte, NE 69101
Garold W. Mahnken
Affiliation:
Univ. Nebraska, Dep. Agron., West Cent. Res. and Ext. Ctr., North Platte, NE 69101
Gordon E. Hanson
Affiliation:
Univ. Nebraska, Dep. Agron., West Cent. Res. and Ext. Ctr., North Platte, NE 69101
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Abstract

Spring small grains were not as competitive with barnyardgrass and witchgrass as winter wheat. Winter wheat grain yields were greater than spring barley or spring wheat in 1986, 1987, and 1988 and oat in 1986 and 1988. Barnyardgrass, stinkgrass, and witchgrass control with glyphosate plus 2,4-D plus atrazine at 0.6 plus 0.8 plus 1.7 kg ha−1 was usually less when the herbicides were applied to stubble of spring small grain versus winter wheat due to the advanced weed growth at treatment Barnyardgrass and witchgrass were more difficult to control than stinkgrass, redroot pigweed, tumble pigweed, kochia, and tumble thistle. No-till corn planted into winter wheat stubble had fewer barnyardgrass and witchgrass than corn planted into spring wheat stubble. The addition of metolachlor plus atrazine at 1.7 plus 0.6 kg ha−1 eliminated differences among small grain cultivars in weed control in corn. Corn grain yields from winter wheat plots were greater than other small grains in 1989 because of better weed control and more crop residue.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineglyphosate, N-(phosphonomethyl)glycinemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy)-1-methylethyl)acetamide2,4-D, (2,4-dichlorophenoxy)acetic acidbarnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCGkochia, Kochia scoparia (L.) Schrad. # KCHSCredroot pigweed, Amaranthus retroflexus L. # AMAREslimleaf lambsquarters, Chenopodium leptophyllum (Moq.) Nutt. ex S. Wats. # CHELEstinkgrass, Eragrostis cilianensis (All.) E. Mosher # ERACNtumble pigweed, Amaranthus albus L. # AMAALtumble thistle, Salsola collina Pallwitchgrass, Panicum capillare L. # PANCAbarley, Hordeum vulgare L., ‘Steptoe’ and ‘Teton’corn, Zea mays L., ‘Cenex 451’oat, Avena sativa L., ‘Ogle’wheat, Triticum aestivum L., ‘Bronze Chief,’ ‘Brule,’ and ‘James.’Atrazineglyphosatemetolachlor2,4-Dcompetitioncrop rotationecofarmingno-tillagespring wheatwinter wheatAMAALAMAREECHCGERACNKCHSCPANCA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 128 - 133
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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