Question:
In Universal soil loss equation, "A=RKLSCP", K stands for :
In Universal soil loss equation, "A=RKLSCP", K stands for :
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Do not confuse "Erosivity" (\( R \)) with "Erodibility" (\( K \)).
Erosivity is a property of the rainfall (external force), while erodibility is an inherent physical property of the soil itself.
Erosivity is a property of the rainfall (external force), while erodibility is an inherent physical property of the soil itself.
Updated On: Jul 21, 2026
- Soil erodibility index
- Soil erosivity index
- Slope length factor
- Slope gradient factor
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The Universal Soil Loss Equation (USLE) is a mathematical model used to estimate long-term average annual soil loss from water erosion.
Key Formula or Approach:
The USLE model is expressed as:
\[ A = R \times K \times L \times S \times C \times P \]
Step 2: Detailed Explanation:
Let us break down each parameter of the USLE equation:
- \( A \): Computed spatial average soil loss per unit area, typically expressed in tons per acre per year.
- \( R \): Rainfall and runoff erosivity factor. It measures the erosive force of a specific rainfall.
- \( K \): Soil erodibility factor (or index). It represents both susceptibility of soil to erosion and the rate of runoff. It is based on soil texture, structure, organic matter content, and permeability.
- \( L \): Slope length factor. It represents the ratio of soil loss from the field slope length to that from a 72.6-foot length under identical conditions.
- \( S \): Slope steepness (gradient) factor.
- \( C \): Cover and management factor (related to crop type and tillage).
- \( P \): Support practice factor (such as contouring, strip-cropping, or terracing).
Step 3: Final Answer:
In the USLE equation, \( K \) stands for the Soil erodibility index/factor.
Thus, Option (A) is correct.
The Universal Soil Loss Equation (USLE) is a mathematical model used to estimate long-term average annual soil loss from water erosion.
Key Formula or Approach:
The USLE model is expressed as:
\[ A = R \times K \times L \times S \times C \times P \]
Step 2: Detailed Explanation:
Let us break down each parameter of the USLE equation:
- \( A \): Computed spatial average soil loss per unit area, typically expressed in tons per acre per year.
- \( R \): Rainfall and runoff erosivity factor. It measures the erosive force of a specific rainfall.
- \( K \): Soil erodibility factor (or index). It represents both susceptibility of soil to erosion and the rate of runoff. It is based on soil texture, structure, organic matter content, and permeability.
- \( L \): Slope length factor. It represents the ratio of soil loss from the field slope length to that from a 72.6-foot length under identical conditions.
- \( S \): Slope steepness (gradient) factor.
- \( C \): Cover and management factor (related to crop type and tillage).
- \( P \): Support practice factor (such as contouring, strip-cropping, or terracing).
Step 3: Final Answer:
In the USLE equation, \( K \) stands for the Soil erodibility index/factor.
Thus, Option (A) is correct.
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