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Rate and Time of Bentazon/Atrazine Application for Broadleaf Weed Control in Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Allan S. Hamill  and
Jianhua Zhang
Allan S. Hamill
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Harrow, ON, Canada NOR 1G0
Jianhua Zhang
Affiliation:
Research Centre, Agriculture and Agri-Food Canada, Harrow, ON, Canada NOR 1G0
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Abstract

The effects of herbicide–adjuvant combinations and times of application on weed density and corn yield were determined in a 3-yr field study. At a given rate and time of application of bentazon/atrazine, Assist and Merge were equally effective adjuvants. Assist would be the adjuvant of choice for bentazon/atrazine rather than Merge because of its currently lower cost. Weed density depended on the rate and time of application of bentazon/atrazine. In general, bentazon/atrazine applied at early stages (7 d after emergence) of the development of corn seedlings or at high or intermediate rate (1.6 or 0.8 kg ai/ha) maintained low weed densities, with a relatively small range of variation over years. Delay in time (14 or 21 d after emergence) or reduction in herbicide rate (0.4 kg ai/ha) increased the risk of high weed pressure, although it was not always associated with yield loss. The best time for the application of postemergence herbicide appears to be a few days prior to the onset of the critical period of weed control.

Keywords

Atrazine, 6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diaminebentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidecorn, Zea mays (L.)Herbicide ratetime of spraycanonical discriminant analysiscorn yieldadjuvantbroadleaf weedsAbutilon theophrastiAmaranthus retroflexusAmbrosia artemisiifoliaChenopodium albumPolygonum persicariaABUTHAMAREAMBELCHEALPOLPE
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 549 - 555
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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