3 research outputs found
Not Available
Not AvailablePermissible erosion rate also known as soil loss tolerance (‘T’ value) is defined as maximum erosion that can take place on a
given soil without degrading its long-term productivity. In India, default ‘T’ value of 11 2Mgha 1 y 1 is used for devising land
restoration strategies for different types of soils. However, ability of soil to resist degradation varies with soil type, depth and
physico-chemical characteristics. Therefore, the present investigation was undertaken to determine ‘T’ value of different
landforms of Delhi State by taking into account the soil saturated hydraulic conductivity (SHC), bulk density (BD), organic
carbon, erodibility and soil pH. Soil state was defined by a quantitative model and scaling functions were used to convert soil
parameters to a 0–1 scale. The normalised values were multiplied by appropriate weighting factors based on relative importance
and sensitivity analysis of each indicator. Categorical rankings of I, II or III were assigned to soil groups based on overall
aggregate score. ‘T’ value of different landforms of Delhi State was computed using the guideline of USDA-Natural Resource
Conservation Services. Majority of landforms of Delhi had ‘T’ value of 12 5Mg ha 1 y 1, except for the soils of hill terrain,
dissected hill, pediment and piedmont plain, where ‘T’ value ranged from 5 to 10Mg ha 1 y 1. These ‘T’ values could be used
for conservation planning and will help the planners in devising suitable land restoration strategiesNot Availabl