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Acetanilide Activity and Dissipation as Influenced by Formulation and Wheat Stubble

Published online by Cambridge University Press:  12 June 2017

B. B. Petersen ,
P. J. Shea  and
G. A. Wicks
B. B. Petersen
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
P. J. Shea
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
G. A. Wicks
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
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Abstract

Laboratory and field research was conducted to determine the influence of winter wheat (Triticum aestivum L.) stubble on weed control and the dissipation of emulsifiable concentrate formulations (EC) of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide], alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide], and acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide]; and microencapsulated formulations (ME) of alachlor and acetochlor. EC metolachlor provided better weed control than EC alachlor when applied 28 days before planting sorghum (Sorghum bicolor L.) and similar weed control when applied at 1 or 14 days before planting. This difference was attributed to more rapid EC alachlor dissipation. The order of relative herbicide persistence at 24 C and 33% (w/w) soil moisture in a silty clay loam was ME acetochlor = ME alachlor > EC metolachlor > EC acetochlor = EC alachlor. Acetanilide degradation was affected more by increasing temperature from 15 to 24 C than by increasing soil moisture from 15 to 33%. More herbicide was washed from overwintered than fresh straw in the first 1 cm of simulated rainfall. In the first simulated rainfall event, more herbicide was removed from straw that had been dry than wet at application, but the amount of herbicide remaining on dry and wet straw was similar after four events. Formulation generally did not affect herbicide wash-off.

Keywords

Degradationpersistenceecofallowno-tillmicroencapsulation
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 2 , March 1988 , pp. 243 - 249
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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