Question:
Soil loss tolerance values at top soil depth vary between :
Soil loss tolerance values at top soil depth vary between :
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- 1 t/ha/year is equivalent to 1 Mg/ha/year.
- In general conservation planning, 11 t/ha/year (approx. 5 tons/acre/year) is treated as the absolute upper limit of permissible soil loss for deep agricultural soils.
- In general conservation planning, 11 t/ha/year (approx. 5 tons/acre/year) is treated as the absolute upper limit of permissible soil loss for deep agricultural soils.
Updated On: Jul 24, 2026
- 2-11 t/ha
- 11-19 Mg/ha
- 19-26 t/ha
- 26-35 Mg/ha
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Soil loss tolerance (T-value) is defined as the maximum rate of annual soil erosion that can occur on a given soil without causing a decline in long-term agricultural productivity or degrading water quality.
It represents a threshold value where the rate of soil erosion is roughly in balance with the natural rate of soil formation.
Step 2: Detailed Explanation:
The soil loss tolerance value depends on soil properties such as topsoil depth, rooting depth, subsoil characteristics, and organic matter content.
According to soil conservation guidelines (including those by the USDA-NRCS and ICAR-CSWCRTI in India):
- For deep, fertile, well-drained soils with favorable subsoil characteristics, the maximum soil loss tolerance limit is established at about 11 tonnes per hectare per year (t/ha/yr) or 11 Mg/ha/yr.
- For shallow, eroded, or highly vulnerable soils with limiting subsoil layers, the tolerance limit is much lower, set at around 2 t/ha/yr.
Therefore, the standard soil loss tolerance values for agricultural soils typically vary between 2 to 11 t/ha/year.
Erosion rates exceeding 11 t/ha/yr lead to permanent degradation of the soil resource base.
Step 3: Final Answer:
The soil loss tolerance values vary between 2-11 t/ha (Option A).
Soil loss tolerance (T-value) is defined as the maximum rate of annual soil erosion that can occur on a given soil without causing a decline in long-term agricultural productivity or degrading water quality.
It represents a threshold value where the rate of soil erosion is roughly in balance with the natural rate of soil formation.
Step 2: Detailed Explanation:
The soil loss tolerance value depends on soil properties such as topsoil depth, rooting depth, subsoil characteristics, and organic matter content.
According to soil conservation guidelines (including those by the USDA-NRCS and ICAR-CSWCRTI in India):
- For deep, fertile, well-drained soils with favorable subsoil characteristics, the maximum soil loss tolerance limit is established at about 11 tonnes per hectare per year (t/ha/yr) or 11 Mg/ha/yr.
- For shallow, eroded, or highly vulnerable soils with limiting subsoil layers, the tolerance limit is much lower, set at around 2 t/ha/yr.
Therefore, the standard soil loss tolerance values for agricultural soils typically vary between 2 to 11 t/ha/year.
Erosion rates exceeding 11 t/ha/yr lead to permanent degradation of the soil resource base.
Step 3: Final Answer:
The soil loss tolerance values vary between 2-11 t/ha (Option A).
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