CHARACTERISATION OF TANK SEDIMENTS OF DHARWAD DISTRICT
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Date
2001
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD
Abstract
"An investigation was iindertaken to study the physico-chemical
properties of tank sediments of selected tanks representing Kalaghatgi,
Dharwad, Hubli, Kundagol and Navalgund taluks of Dharwad district and
also to study the physico-chemical properties of soils and crop performance
in soils receiving tank sediments and in comparison with soils not receiving
tank sediments.
The results indicated that the per cent sand, fine sand and silt values
were lower in comparison with clay contents in respective tank sediments.
The clay content was higher in sediments of tanks in taluks receiving lower
rainfall with plain catchment topography.
Tank sediments of taluks with higher annual average rainfall
possessed lower values of maximum water holding capacity, pH, electrical
conductivity, cation exchange capacity, total and available phosphorus,
potassium, total copper, zinc and manganese. In contrast, these sediments
had higher organic carbon, total and available nitrogen, iron, available
copper, zinc and manganese. The reverse trend was visible in tank
sediments from catchments of lower average annual rainfall.
Practice of addition of silty loam tank sediment to clay soils resulted in
increased sand and silt content, bulk density, initial as well as basic
infiltration rate and slight decrease in maximum water holding capacity.
Chemical properties indicted decrease in boil pH, electrical conductivity and
increase in organic carbon, total and available nitrogen, phosphorus,
available potassium and micronutrients. Higher average bengalgram yields
were recorded in fields receiving tank sediments."
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No. of references 56