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Book: Determinants of Soil Loss Tolerance
Published by: American Society of Agronomy and Soil Science Society of America

 

This chapter in DETERMINANTS OF SOIL LOSS TOLERANCE

  1.  p. 87-93
    ASA Special Publication 45.
    Determinants of Soil Loss Tolerance

    B.L. Schmidt (ed.)

    ISBN: 978-0-89118-311-2

     

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doi:10.2134/asaspecpub45.c8

Soil Loss Tolerance1

  1. E. L. Skidmore2

Abstract

A function is developed for defining soil loss tolerance (T value) that provides for permanent preservation of the soil resource, prohibits erosion that contributes excessively to pollution, and is a function of the present soil depth. The relationship is expressed by T(x,y,t) =(T1 + T2)/2 − (T2 − T1)/2 cos [π(z −z1)/(z2 —z1)], where T(x,y,t) is tolerable soil loss rate at point (x,y), and T1 and T2 are lower and upper limits of allowable soil loss rate, T1 corresponds to soil renewal rate, z1 and z2 are minimum allowable and optimum soil depths, and z is the present soil depth. Tolerable soil loss function between the points (T1,Z1) and (T2,z2) is sinusoidal and dependent upon soil depth and (T2 − T1)/2 is the amplitude. The period is represented by the cosine argument and goes from 0 to 180 degrees for values of z between the limits of z1 and z2. Examples of application are given.

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Copyright © 1982. Copyright 1982 by the American Society of Agronomy and Soil Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA