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University of Agricultural Sciences, Dharwad (2001)

CHARACTERISATION OF TANK SEDIMENTS OF DHARWAD DISTRICT

Ramesh, N R

Titre : CHARACTERISATION OF TANK SEDIMENTS OF DHARWAD DISTRICT

Auteur : Ramesh, N R

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science (MS) Agriculture 2001

Résumé
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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