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This article in AJ

  1. Vol. 73 No. 5, p. 763-767
     
    Received: Nov 19, 1979
    Published: Sept, 1981


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doi:10.2134/agronj1981.00021962007300050004x

Prediction of Boll Opening in a Cotton Crop1

  1. Daniel Wallach and
  2. Elazar Kletter2

Abstract

Abstract

A number of management decisions in cotton (Gossypium hirsutum L) production rely heavily on estimated dates of boll opening. A simple, quantitative method to predict the timing of boll opening is presented here. The algorithm is based on the assumption that all large bolls will become open bolls after a fixed number of degreedays. The rate of large boll accumulation and the number of degreedays from large to open boll are taken from field counts of large and o en bolls if possible. Otherwise, default values are use8. The algorithm was tested with data from 13 commercial, irrigated cotton fields in Israel. Predictions of subsequent boll opening, made shortly after boll opening began, gave an average error of 4.5 open bollslm-row. This method of predicting boll opening is practical for individual growers, since the requirements in terms of data and computing time are small.

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