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Agronomy Journal Abstract -

Small-Grain Equivalent of Mixed Vegetation for Wind Erosion Control and Prediction


This article in AJ

  1. Vol. 84 No. 1, p. 98-101
    Received: Feb 5, 1991

    * Corresponding author(s):
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  1. E.L. Skidmore  and
  2. R.G. Nelson
  1. U SDA-ARS, Kansas State Univ., Manhattan, KS 66506-4006
    E ngineering Extension, Kansas State Univ., Manhattan, KS 66506-2508



Control and prediction of wind erosion require knowledge of the effectiveness of surface vegetative cover. The effectiveness is usually referenced to as small-grain equivalent. The procedure used to convert mixed vegetation to small-grain equivalent was found faulty. Improper weighting of regression coefficients caused the conversion procedure to predict that adding crop residue decreased small-grain equivalent. Therefore, the purpose of this analysis was to improve the conversion of mixed vegetation to a small-grain equivalent. The new expression derived for this purpose gave a logical conversion where the previous procedure failed. It did not predict a decreasing smallgrain equivalent with increased soybean [Glycine max (L.) Merr.] residue in the 0 to 300 kg/ha range as did the former method. Applied to the same data that were used for testing the previous procedure, the new procedure reduced the error by almost 50%. The new procedure improves the conversion of mixed vegetation to small-grain equivalent.

Joint contribution of the USDA-ARS and Kansas Agric. Exp. Stn., Contribution no. 91-312-J.

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