Vulnerability of Selected Soils in the Different Rainfall Areas to Degradation and Excessive Leaching after Winery Wastewater Application

A.R. Mulidzi, C.E. Clarke, P.A. Myburgh

Abstract


A pot trial was conducted to assess the effect of simulated rainfall on six soils with different textures, irrigated with winery wastewater diluted to a chemical oxygen demand (COD) level of 3000 mg/L over one simulated irrigation season. Thereafter, simulated winter rainfall was applied to the pots. The rainfall was simulated according to the long term averages of the regions where the soils originated. Leaching of cations, particularly K+ and Na+ occurred only from four of the six soils when winter rainfall was simulated.  In one of the sandy soils, the simulated rainfall was too low to allow leaching. In another soil, high clay content of 35% in combination with low rainfall prevented leaching. In three soils that received the same
amount of rainfall, more cations leached from the duplex sandy soil compared to the two other soils. These trends indicated that leaching of cations was a function of soil texture and rainfall. The study showed
that in regions with low rainfall, irrigation with winery wastewater would lead to the accumulation of cations thereby increasing soil salinity. The study confirmed that for sustainable use of winery wastewater
irrigation in agriculture, different soil types will require individual management in order to avoid or minimize the negative environmental impact on natural resources by wastewater irrigation.


Keywords


Chemical oxygen Demand, Rainfall simulation, Water Quality

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References


Amezketa, E., Aragüés, R. & Gazol R., 2004. Infiltration of water in disturbed soil columns as affected by clay dispersion and aggregate slaking. Sp. J. Agric. Res. 2, 459-471.

Department of Water Affairs & Forestry, 1996. South African Water Quality Guidelines (second edition). Volume 1: Domestic Use. Department of Water Affairs & Forestry, Private Bag X313, Pretoria, 0001.

Dobrowsky, P.H., 2014. Quality assessment of domestic harvested rainwater in the peri-urban region of Kleinmond, Western Cape and the optimisation of point-of-use treatment systems. Thesis, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.

Howell, C.L. & Myburgh, P.A., 2018. Management of Winery Wastewater by Re-using it for Crop Irrigation – A Review. S. Afr. J. Enol. Vitic. 39, 116-132.

Howell, C.L., Myburgh, P.A., Lategan, E.L. & Hoffman, J.E., 2018. Effect of Irrigation Using Diluted Winery Wastewater on the Chemical Status of a Sandy Alluvial Soil, with Particular Reference to Potassium and Sodium. S. Afr. J. Enol. Vitic. 39, DOI: http:// dx.doi.org/10.21548/39-2-3171.

IUSS Working Group WRB., 2014. World Reference Base for Soil Resources. International classification system for naming soils and creating legends for soil maps. World Soil Resources Reports No. 106. FAO, Rome.

Mulidzi, A.R., Clarke, C.E. & Myburgh, P.A., 2019. Response of Soil Chemical Properties to Irrigation with Winery wastewater on a Well-drained Sandy Soil. S. Afr. J. Enol. Vitic. DOI: https://doi.org/10.21548/42-2-3403.

Mulidzi, A.R., Clarke, C.E. & Myburgh, P.A., 2018. Annual dynamics of winery wastewater volumes and quality and the impact of disposal on poorly drained duplex soils. S. Afr. J. Enol. Vitic. 39, 305-314.

Mulidzi, A.R., Clarke, C.E. & Myburgh, P.A., 2016. Design of a pot experiment to study the effect of irrigation with diluted winery wastewater on four differently textured soils. Water SA 42, 20-25.

Mulidzi, A.R., Clarke, C.E. & Myburgh, P.A., 2015. Effect of Irrigation with Diluted Winery Wastewater on Cations and pH in Four Differently Textured Soils. S. Afr. J. Enol. Vitic. 36, 402-412.

Muller, K., Magesan, G.N. & Bolan, N.S., 2007. Review: A critical review of the influence of effluent irrigation on the fate of pesticides in soil. Agr. Ecosyst. Environ. 120, 93-116.

Myburgh, P., 2012. Guidelines for vineyard irrigations with saline water. Wynboer Technical yearbook 2012, 94-96.

Ott, R. L., 1998. An Introduction to statistical methods and data analysis. Belmont, California, Duxbury Press, 807-837.

SAS, 2008. SAS Version 9.2., SAS Institute, Campus Drive, Cary, North Carolina 27513.

Shapiro, S.S. & Wilk, M.B., 1965. An analysis of variance test for normality (complete samples). Biometrika 52, 591-611.

Soderberg, K., 2003. Geochemistry of the fynbos ecosystem in a Table Mountain Group sub-catchment of the Olifants River, Western Cape, South Africa. Thesis, Cape Town University, Private Bag X3, Rondebosch, 7701.

Soil Classification Work Group, 1991. Soil classification – A taxonomic system for South Africa. Memoirs on the Agricultural Natural Resources of South Africa no. 15. Dept. Agricultural Development, Pretoria, South Africa.

Suarez, D.L., Wood, J.D. & Lesch, S.M., 2008. Infiltration into cropped soils: Effect of rain and sodium adsorption ratio-impacted irrigation water. J. Environ. Qual. 37, 169-179.

Vink, N., Deloire, A., Bonnardot, V. & Ewert, J., 2012. Climate change and the future of South Africa’s wine industry. American Association of Wine Economists105, 1-18.




DOI: https://doi.org/10.21548/41-1-3774

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