University of Arizona a dot Cooperative Extension

Estimating Fruit Retention - Procedure
(Publication az1209)
(PDF file version, 36KB

by Jeffrey C. Silvertooth,
Extension Agronomist - Cotton

  1. Count Mainstem Nodes
    Ex.: Nodes = 14
  2. Determine node of first fruiting branch(FFB)
    Ex.: FFB = 6
  3. Determine Number of Vegetative Branches (VB) Ex.: FFB = 6
    Therefore, VB = 5 or FFB - 1 = VB = 5
  4. Count number of aborted sites
    Pre-bloom: first position only
    Post first bloom: first two fruiting sites
    Ex.: Aborts = 7 (first 2 positions)
  5. Determine total fruiting sites
    Total fruiting branches: FB = Nodes - VB
    Sites = FB x 2
    Ex.: 14 Nodes - 5 VB = 9
    9 FB x 2 sites = 18 sites
  6. Calculate % Fruit Retention (FR)
    Retained sites = Total sites - Aborts
    %FR = (retained sites/total sites) x 100
    Ex.: 18 sites - 7 aborts = 11 retained positions
    %FR = (11 retained sites/18 total sites) X 100 = 61%
  7. Refer to UA Baselines
    1. for stage of growth
    2. Heat Units After Planting (HUAP)
  8. Key depicting meaning of abreviations used to indicate cotton plant parts

    Diagram of a cotton plant, with the different plant parts indicated

    % fruit retention curves ploted on the heat units accumulated after planting for Pima and Upland cotton (used to make management decisions based on the progress of the plants)

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 Jeffrey C. Silvertooth,
Extension Agronomist - Cotton, College of Agriculture, The University of Arizona.
Material written February 2001.

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