Alfalfa Report Yuma County, Arizona May 20, 2002 Yuma County Office Production Update: Alfalfa sensitivity to water stress: Alfalfa is most sensitive to water stress after a cutting. Yield losses as much as 30% have been reported for delaying irrigation after cutting by 6 days. It is impossible, of course, to irrigate immediately after cutting when producing alfalfa hay. However, the irrigation before cutting could be timed so that soil moisture is available for regrowth after cutting. Caution must be exercised to avoid soil conditions that are so wet at cutting that compaction results, which has long term consequences perhaps more serious than soil that is too dry at cutting.Insect Management: Spider mites ( Weed Control: The time has passed when the contact herbicides,
Gramoxone and Buctril, can be safely and effectively used in alfalfa.
Hot, dry conditions, rapid crop regrowth, and preharvest intervals make
it difficult to safely and effectively use these products between March
and October. They also are weak on grasses, which are the predominate
summer weeds.
10 Year Summary (May 7 - May 20, 1993-2002):
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endorsement by The University of Arizona. Information provided by: Barry Tickes, btickes@ag.arizona.edu Extension Agent, Yuma County Michael Ottman, mottman@ag.arizona.edu Agronomy Specialist College of Agriculture, The University of Arizona. Eric Natwick, etnatwick@ucdavis.edu UCCE Imperial County - Farm Advisor University of California, Davis, CA. | ||||||||||||||||
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