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

USDA-ARS, Kansas State Univ., Manhattan, KS 66506-4006
Engineering Extension, Kansas State Univ., Manhattan, KS 66506-2508

^* Corresponding author.

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.

Received for publication February 5, 1991.