Yuma County, Arizona
February 10, 2003
Yuma County Office
Nitrogen from alfalfa: Grass plants grown in mixture with alfalfa typically obtain 20 to 30% of their nitrogen from alfalfa. The amount of nitrogen transferred to a grass growing in alfalfa can reach 22 pounds of nitrogen per acre per year. Transfer of nitrogen from alfalfa to other plants can occur through 1) excretion from roots (less than 1% of total), 2) root death and decay, 3) fungi, 4) leaching from living plant matter, and 5) decomposition of dead plant matter on the soil surface.
Insect Management: Clover root curculio adults are small gray and brown mottled weevils that are often confused with Egyptian alfalfa weevil adults (PDF file, 48KB) (photo).Clover root curculio adults have a short blunt snout and are about 2/3 the size of alfalfa weevil adults. Little is known about the potential damage from clover root curculio. The adults feed on foliage and stems and do not cause economic damage. Larvae feed on roots and on some occasions may cause damage, but the seriousness of this damage has not been assessed. No treatment recommendations exist for this pest. It is important not to confuse the clover root curculio with Egyptian alfalfa weevil.
Weed Control: Trifluralin granules can sit in the field for 3-5 days before being incorporated with irrigation water without a reduction in efficacy. Eptam granules, on the other hand, must be incorporated within 12 hours, especially if dew or other sources of moisture are present, or weed control will be significantly reduced.
10 Year Summary (Jan 28 - Feb 10, 1994-2002):
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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