Potassium in winery waste waters used for irrigation and soil structural decline

Rengasamy, Pichu and Marchuk, Alla (2011) Potassium in winery waste waters used for irrigation and soil structural decline. In: 22nd Grape and Wine Science Symposium (Crush 2011), 28-30 Sep 2011, Adelaide, Australia.

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Long-term application of winery waste water containing high levels of potassium will lead to build-up of exchangeable potassium in soils which can cause soil structural problems similar to exchangeable sodium. Conflicting reports on the effect of exchangeable potassium, being either equal to or less than that of sodium, are found in the literature. We investigated the dispersive and flocculating powers of cations viz. Na, K, Mg and Ca on the basis of our concept that the degree of ionicity (or covalency) of clay-cation bonds determine the dispersion and flocculation of soil clays. Our experimental results were in conformity with the theoretical values of flocculating powers of cations. Compared to Na=1, the flocculating power of the other common cations would be K=1.8, Mg=27, and Ca=45. Flocculating power gives the inverse of dispersive effects. Based on these notions, a ratio analogous to the SAR (sodium adsorption ratio), but which incorporates the differential effects of Na and K in dispersing soil clays, and also the differential effects of Ca and Mg in flocculating soil clays was derived as:
Cation ratio of soil structural stability (CROSS) = (Na+0.56K)/ [(Ca+0.6Mg)/2]0.5. Where the concentrations of these ions are expressed in millimole of charge/L. The effectiveness of CROSS in predicting the soil structural decline, particularly when potassium is dominant in irrigation water, was tested using a few soils from South Australia. The results on clay dispersion from soils and soil saturated hydraulic conductivity confirm the superiority of CROSS compared to SAR which is currently used for the evaluation of the quality of irrigation waters.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: No
Item Status: Live Archive
Additional Information: Copyright 2011 for the content of these abstracts and the full papers presented at the Symposium remains with the authors. Paper no. 12
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 12 Sep 2016 00:15
Last Modified: 31 Jan 2017 01:17
Uncontrolled Keywords: irrigation runoff; potassium; wine growing; effects on soil
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Socio-Economic Objective: D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960608 Rural Water Evaluation (incl. Water Quality)
URI: http://eprints.usq.edu.au/id/eprint/25897

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