University of Arizona a dot Cooperative Extension

Alfalfa Report
Yuma County, Arizona
October 7, 2002

Yuma County Office
2200 W. 28th Street, Ste. 102
Yuma, AZ 85364
(928) 726-3904
(928) 726-8472 FAX

Production Update:

Phosphorus fertilizer: In a 3-year study conducted at Maricopa, surface-applied 11-52-0 and water-run 10-34-0 were equally effective in increasing alfalfa yield. The fertilizer was applied annually in December. These results demonstrate that the alfalfa plant is capable of utilizing P from surface-applied fertilizer that is not mechanically incorporated. Most of the P fertilizer remained in the surface 3 inches of soil whether or not it was surface-applied or water-run.

Insect Management: Sowbugs and pillbugs ( Detour signpicture) are crustaceans, more closely related to crayfish than insects. Commonly encountered in fields with an abundance of decomposing plant residue from a previous crop. They are oval in shape, appear to be many segmented, and are up to 0.5 inch long. Sowbugs are pests of seedling stands and rarely, if ever, cause problems in established stands. In newly planted fields, sowbugs can destroy seedlings by clipping them off. Control sowbugs using an insecticide bait spread evenly over the field or by using a broad spectrum insecticide spray.

Weed Control: Roundup ready alfalfa seed is expected to be available in the next few years. Glyphosate is the same herbicide that has been used for 30 years and the rates, timing and weeds controlled are well known. Using it in alfalfa will be complicated by the frequent cuttings and rapid regrowth. Weeds should not be cut before the herbicide has translocated through them and applications should not be made when weeds are covered by the crop.

Market Summary
Off grade
Past 2 Weeks (Sept. 24 - Oct. 7, 2002)
Last Year (Sept. 24 - Oct. 7, 2001)


10 Year Summary (Sept. 24 - Oct. 7, 1993-2002):
10 year summary (Sept 24 - Oct 7 1993-2002)

Full Disclaimers

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, Extension Agent, Yuma County
Michael Ottman, Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, UCCE Imperial County - Farm Advisor
University of California, Davis, CA.

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