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Published online 1 September 1970
Published in Agron J 62:615-618 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Wind Structure above and within a Soybean Canopy1

E. R. Perrier, R. J. Millington, D. B. Peters and R. J. Luxmoore2

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.

Key Words: Normal turbelent flow • Skimming turbulent • Anemometers

1 Contribution from the Corn Belt Branch, Soil and Water Conservation Research Division, Agricultnral Research Service, USDA, in cooperation with the Illinois Agricultural Experiment Station.

2 Research Soil Scientist, USDA; Research Soil Scientist, USDA, and Associate Professor of Soil Physics, Agronomy Department, University of Illinois; Research Soil Scientist, USDA, and Professor of Soil Physics, Agronomy Department, University of Illinois; and Research Associate in Soil Physics, Agronomy Department, University of Illinois, Urbana, Ill.; respectively.

Received for publication February 11, 1970.


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[Abstract] [PDF]


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Copyright © 1970 by the American Society of Agronomy.