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Authors
Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), IN
2 Department of Soil Sciences, College of
Agriculture, University of Agricultural Sciences,
Dharwad (Karnataka), IN
3 Directorate of Research, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), IN
Source
An Asian Journal of Soil Science, Vol 4, No 2 (2010), Pagination: 254-257
Abstract
An investigation was undertaken to study the effect of long-term application of spentwash (5 to 20 years) on vertisol with special emphasis on K-adsorption desorption phenomenon. The highest amounts of water soluble, exchangeable and non-exchangeable K were observed in pedon-1 which received spentwash irrigation for >20 years. The cumulative K release values obtained for surface soils with successive extraction with boiling 1N HNO3 ranged from 692 to 5220 mg kg-1. The constant rate K values ranged from 16 to 17 mg kg-1. Spentwash irrigated pedons recorded more K adsorption compared to unirrigated one. Lowest K-adsorption was observed in pedon-5 (control) that ranged from 1338 to 1422.39 mg kg-1 while highest (1422.19 to 1898.10 mg kg-1) adsorption was recorded in pedon irrigated with spentwash for more than 20 years.
Keywords
Spentwash, Adsorption, CR-K, Non-Exch. K, Desorption.
