University of Arizona a dot Cooperative Extension


Height to Node Ratio - Procedure
(Publication az1210)
(PDF file version, 33KB)


by Jeffrey C. Silvertooth,
Extension Agronomist - Cotton

  1. Identify Cotyledonary Nodes
    Ex.: Nodes = 0
  2. Count total mainstem nodes
    Cotyledonary Nodes = 0
    top (last) node has an attached leaf 1 inch diameter or greater (about quarter size)
    Ex.: Total Nodes = 14
  3. Measure plant height (inches)
    Cotyledonary nodes to terminal
  4. Calculate height to node ratio (HNR)
    Example: Height = 17 inches
    Nodes = 14
    HNR = 17/14 = 1.2
  5. Refer to UA Baselines
    • for stage of growth
    • Heat Units After Planting (HUAP 86/55o F)

    Diagram of a cotton plant with various important plant parts labeled

    Height to node ratio curve plotted on heat units accumulated after planting for Upland cotton

    Height to node ratio curve plotted on heat units accumulated after planting for Pima cotton


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, silver@ag.arizona.edu
Extension Agronomist - Cotton, College of Agriculture, The University of Arizona.
Material written February 2001.
 



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