ASSESSMENT OF SOIL QUALITY INDICATORS OF CHANNEGOWDARAPALYA MICROWATERSHED OF KUNIGAL TALUK, TUMKUR DISTRICT USING REMOTE SENSING AND GIS
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Date
2019-08-02
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
Soil quality assessment of Channegowdarapalya microwatershed, Kunigal taluk,
Tumkur district was carried out using cadastral map and Cartosat-1 satellite imagery at
1:7920 scale. Soil site characteristics showed non-gravelly, slightly eroded, gently
sloping land in majority of the area with near neutral soil pH and normal EC. The surface
soil fertility maps indicated low OC, available nitrogen and available K2O, whereas
available P2O5, secondary and micronutrients were adequate except zinc which was
deficient. Eight out of fifteen soil profiles were selected as the master profiles. Soils were
shallow to very deep, coarse textured, from strong brown to dark red coloured with subangular
blocky structure. Nineteen soil phases including eight soil series were identified.
There was increase in clay, bulk density, soil pH, available K2O, exchangeable calcium
and magnesium with depth, whereas OC, available nitrogen, available P2O5 and available
sulphur, micronutrients and dehydrogenase activity have decreased. The land suitability
for selected cereals and horticultural crops indicated that, out of total area, 17.9 to 26.7
per cent of area was highly suitable for crops like mango, jamun, sapota, guava, cashew
and 4.5 to 13.3 per cent area was not suitable for plantations. Marginally suitable to
moderately suitable with major limitation of depth, texture and gravel in few parcels. Soil
quality index recorded higher value in lower part of midland and lower in upland. Soil
reaction (38%), calcium (34%), zinc (11%), OC (9%), and nitrogen (8%) contents are the
major contributors for soil quality.
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