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This article in AJ

  1. Vol. 62 No. 5, p. 615-618
     
    Received: Feb 11, 1970
    Published: Sept, 1970


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doi:10.2134/agronj1970.00021962006200050018x

Wind Structure above and within a Soybean Canopy1

  1. E. R. Perrier,
  2. R. J. Millington,
  3. D. B. Peters and
  4. R. J. Luxmoore2

Abstract

Abstract

The turbulent structure of wind within and above a soybean canopy was studied utilizing observations of wind speed, standard deviation, and frequency distributions. Within the validity of the one-dimensional logarithmic profile relation .(above the soybean canopy) the transfer coefficient and mixing length are calculated. The data indicate that the fluid motion within the soybean canopy is aerodynamicallyd ifferent from the turbulent air layer above the plant canopy, which suggests a two-dimensional flow cavity. "The skewed frequency distribution and high standard deviations within the soybean canopy suggest difficulty in describing the vector direction and gradient relations using data collected from anemometers which measure all wind components in the horizontal plane.

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