An Asian Journal of Soil Science

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Long Term Effect of Spentwash Irrigation on Potassium Releasing Power of Vertisol


Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
2 Department of Soil Sciences, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
3 Directorate of Research, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
     

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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.
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  • Long Term Effect of Spentwash Irrigation on Potassium Releasing Power of Vertisol

Abstract Views: 259  |  PDF Views: 0

Authors

Mahesh S. Goudar
Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
B. I. Bidari
Department of Soil Sciences, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
K. K. Math
Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India
H. T. Channal
Directorate of Research, College of Agriculture, University of Agricultural Sciences, Dharwad (Karnataka), India

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.