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    Citrus Orchard Floor Management 2001-2003: Comparison of a Disk, “Perfecta” Cultivator, and Weed Sensing Sprayer

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    Author
    Rector, Ryan J.
    McCloskey, William B.
    Wright, Glenn C.
    Sumner, Chris
    Affiliation
    Department of Plant Sciences, University of Arizona, Tucson, Arizona
    Department of Plant Sciences, Yuma Mesa Agricultural Center, University of Arizona, Yuma, Arizona
    Yuma County Pest Abatement District, Yuma, Arizona
    Issue Date
    2003
    Keywords
    Agriculture -- Arizona
    Citrus fruits -- Arizona
    Orchard floor management
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Citrus Research Report
    Abstract
    An optical weed sensing sprayer (WeedSeeker) was evaluated for making postemergence glyphosate herbicide applications in a Yuma, AZ lemon orchard. In addition, mechanical (disk and Perfecta cultivator) and chemical weed control strategies were compared. Results were fairly similar; however, the use of the WeedSeeker units combined with a preemergence herbicide (H1) increased weed control three fold compared to disking (D) and perfecta (P1). Additionally, when the WeedSeeker units were used in conjunction with preemergence herbicides, spray volume was reduced by 66% compared to a conventional sprayer and by 57% when used for postemergence applications only. There was a relationship between weed ground cover and the area sprayed by the WeedSeeker units indicating that maximum postemergence herbicide savings will occur at low weed densities or less than 10% groundcover. The use of a sprayer with an improved suspension system allowed for faster spraying speeds than were possible with the tractor mounted sprayer. Weed control was similar for the conventional and the WeedSeeker sprayer. However, yields were variable for both years. Future investigations will include efforts to develop crop budgets based on experimental operations
    Series/Report no.
    AZ1331
    Series P-137
    Sponsors
    Arizona Citrus Research Council
    Collections
    Citrus Research Report 2003

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