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This article in AJ

  1. Vol. 75 No. 6, p. 1050-1054
     
    Received: Feb 7, 1983
    Published: Nov, 1983


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doi:10.2134/agronj1983.00021962007500060042x

Predicting Soybean Rooting Depth as a function of Soil Temperature1

  1. J. A. Stone,
  2. T. C. Kaspar and
  3. H. M. Taylor2

Abstract

Abstract

A two dimensional predictive simulation of rooting depth has been developed from data which describe the effects of root-zone temperature on soybean [Glycine max (L.) Merr.] root development. The major inputs are equations which describe the rate of taproot and lateral root extension, node development, and the rooting angle as a function of time and temperature. The simulation predicts the extension of the taproot and 10 primary lateral roots for two groups of soybean cultivars. The output consists of a listing of serial rectangular coordinates for each root tip and a computer plot of the root system. The rooting depths predicted by the simulation agree well with field experimental data illustrating the importance of soil temperature in determining the depth of soybean root penetration in extrapolating greenhouse root extension data to a field situation.

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