Performance of a procedure for yield estimation in fruit orchards

Felipe Aravena Zamora, Camila Potin, Dvora-Laio Wulfsohn, Ines Zamora Lagos, Marta Garcia-Finana

    Publikation: KonferencebidragPaperForskning

    Abstract

    Early estimation of expected fruit tree yield is important for the market planning and for
    growers and exporters to plan for labour and boxes. Large variations in tree yield may be found,
    posing a challenge for accurate yield estimation. We evaluated a multilevel systematic sampling
    procedure for fruit yield estimation. In the Spring of 2009 we estimated the total number of fruit in
    several rows in each of 14 commercial fruit orchards growing apple, kiwi, and table grapes in central
    Chile. Survey times were 10-100 minutes for apples, 85 minutes for table grapes, and up to 150
    minutes for kiwis. At harvest in the Fall, the fruit were counted to obtain the true yield. Yields ranged
    from lows of several thousand (grape bunches), to highs of more than 40 thousand fruit (apples,
    kiwis). In 11 orchards, true errors less than 10% were obtained. In two highly variable orchards we
    obtained absolute true errors of about 20%. An analysis based on systematic sub-sampling of
    sample data across each sampling stage was used to determine how to distribute sampling effort to
    acheive the desired precision.
    OriginalsprogEngelsk
    Publikationsdato2010
    Antal sider16
    StatusUdgivet - 2010
    BegivenhedASABE 2010 International Meeting - Pittsburgh, Penn.
    Varighed: 12 jun. 201020 jun. 2010
    Konferencens nummer: Paper No. 1009638

    Konference

    KonferenceASABE 2010 International Meeting
    NummerPaper No. 1009638
    ByPittsburgh, Penn.
    Periode12/06/201020/06/2010

    Bibliografisk note

    Paper available at ASABE online technical library www.asabe.org

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    • Videnskabelige discipliner, metoder, processer og værktøjer

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