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Soil Erosion Estimation for the Sustainable Planning of a Semi-Arid Micro-watershed in Southern Telangana

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Title Soil Erosion Estimation for the Sustainable Planning of a Semi-Arid Micro-watershed in Southern Telangana
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Creator K.V. Rao, R. Rejani, Josily Samuel, Pushpanjali and CA Rama Rao
 
Subject Soil Erosion, Planning, Watersheds, Southern Telangana
 
Description Not Available
ABSTRACT: A spatial soil loss estimation model was developed for estimating the soil loss from Padmaram micro-watershed
in Mahabubnagar District of Telangana State using GIS coupled with Revised Universal Soil Loss Equation (RUSLE). Different
thematic layers of rainfall, soil, land use land cover, flow accumulation and slope were intersected using ARCGIS software and
RUSLE was applied for estimating the soil loss from this ungauged micro-watershed. The daily erosivity was estimated for 57 years
using Aphrodite rainfall data and the slope length factor (LS) factor was determined spatially. The cover and management factor
(C) and conservation practice factor (P) values were selected based on the crops grown and the conservation practices. The mean
annual soil loss for the period 1951 to 2007 was below 3.3 t/ha/y from 87.5% of the micro-watershed area including all the land
use land covers. The mean annual soil loss estimated from crop land with and without bunding was 2.0 and 3.2 t/ha/y. Among the
three predominant land use land cover, the mean annual soil loss was slightly higher for fallow land (3.6 t/ha/y) followed by scrub
land (2.3 t/ha/y) and crop lands (2.0 t/ha/y). The mean annual soil loss estimated from crop land in the upstream, midstream and
downstream of the micro-watershed was 2.3, 2.6 and 2.2 t/ha/y, respectively. The soil loss from crop land during drought, normal and
above normal years was estimated and it has decreased in recent years. The soil loss was estimated for the changing climate scenarios
using PRECIS data. The soil loss from crop land during the base line period (1961-1990) was estimated at 3.2 t/ha/y. It is predicted to
increase during mid-century to 4.0 t/ha/y and decline during end century to 3.0 t/ha/y. In Padmaram watershed, considerable temporal
variation in soil loss across the years was not observed. Soil erosion associated with agricultural practices in semi-arid tropics, leads
to decline in soil fertility and also results in many environmental problems, and hence its quantification is the need of the hour for
planning interventions for controlling erosion for the sustainable agricultural production and water quality.
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Date 2021-08-21T04:36:07Z
2021-08-21T04:36:07Z
2017-12-01
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/58943
 
Language English
 
Relation Not Available;
 
Publisher Not Available