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Herbicides that have residual soil activity are very useful in the low deserts,
where weed seeds continue to germinate with each irrigation year-round. These herbicides
can also be hazardous, however, when sensitive crops are planted into soil where
they are still active. Determining the potential for crop injury from herbicides
used on previous crops can be difficult. Injury potential is related to several
interrelated factors such as soil type, irrigation practices, tillage, environmental
conditions, organic matter and other conditions. Injury can vary from field to field,
year to year and even be variable within the same field. Rotational crop restrictions
on product labels must often cover many diverse conditions and geographic regions
and are frequently much longer than needed. The following chart can be used as a
general guideline:
Click picture to listen to Barry'update
To contact Barry Tickes go to: btickes@ag.arizona.edu.
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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