Yuma County, Arizona
December 16, 2002
Yuma County Office
Frost management: Frost-damaged alfalfa has lower quality due
to leaf loss, lower digestibility, and decreased mineral content. Frost-damaged
alfalfa may also accumulate toxic levels of nitrates in rare cases. Water
application during freezing temperatures can raise the temperature, but
waterlogging can produce negative effects. In the case of alfalfa, the
best protection against frost is a healthy crop. Severe frosts can kill
the tops of the alfalfa plant and new growth must occur from the base
of the plant. Cutting alfalfa after a frost can stimulate this new growth
near the base of the plant, but the new growth is then susceptible to
Weed Control: Raptor, the new broadleaf and grass herbicide developed by BASF, seems to work even slower than Pursuit. After one week, you may think it didn't get sprayed. After two weeks you probably will think it was sprayed but didn't work. The third and fourth week will bring some hope and it may be five to seven weeks before you're pleased with the control. Cold, slow growing periods are when it takes the longest. It is always a good idea to leave even a small area untreated for comparison.
10 Year Summary (Dec. 3 to Dec. 16, 1993 - 2002):
Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture and Life Sciences, The University of Arizona.
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Information provided by:
Barry Tickes, firstname.lastname@example.org Extension Agent, Yuma County
Michael Ottman, email@example.com Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, firstname.lastname@example.org UCCE Imperial County - Farm Advisor
University of California, Davis, CA.
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