Hydro-geochemical processes in an area with saline groundwater in lower Shire River valley, Malawi: An integrated application of hierarchical cluster and principal component analyses

Monjerezi, Maurice; Vogt, Rolf D.; Aagaard, Per; Saka, John D.K.

doi:10.1016/j.apgeochem.2011.05.013

Cited by 96 publications

(55 citation statements)

References 42 publications

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“…Continual use of this irrigation water must, however, be approached with caution as soil salinization is a gradual process. Comparing the irrigation water salinity of 2.1 dS/m (i.e., 2100 µs/ cm) obtained in this study to the ground water salinity of 35,000-36,000 µs/cm in the same area, as reported by Monjerezi et al (2011), clearly depicted that the surface water sources in the area are more suitable for irrigation as opposed to use of ground water sources for the same irrigation purposes. The relatively good quality of surface waters in the region could explain why there is very little dependence on ground water sources for irrigation in the region.…”

Section: Irrigation Water and Soil Salinity Profilessupporting

confidence: 53%

Matching soil salinization and cropping systems in communally managed irrigation schemes

Malota

Mchenga

2018

Appl Water Sci

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Occurrence of soil salinization in irrigation schemes can be a good indicator to introduce high salt tolerant crops in irrigation schemes. This study assessed the level of soil salinization in a communally managed 233 ha Nkhate irrigation scheme in the Lower Shire Valley region of Malawi. Soil samples were collected within the 0-0.4 m soil depth from eight randomly selected irrigation blocks. Irrigation water samples were also collected from five randomly selected locations along the Nkhate River which supplies irrigation water to the scheme. Salinity of both the soil and the irrigation water samples was determined using an electrical conductivity (EC) meter. Analysis of the results indicated that even for very low salinity tolerant crops (EC i < 2 dS/m), the irrigation water was suitable for irrigation purposes. However, root-zone soil salinity profiles depicted that leaching of salts was not adequate and that the leaching requirement for the scheme needs to be relooked and always be adhered to during irrigation operation. The study concluded that the crop system at the scheme needs to be adjusted to match with prevailing soil and irrigation water salinity levels.

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Section: Irrigation Water and Soil Salinity Profilessupporting

confidence: 53%

Matching soil salinization and cropping systems in communally managed irrigation schemes

Malota

Mchenga

2018

Appl Water Sci

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“…For instance, the factors controlling arsenic mobilization in groundwater chemistry were investigated and groundwater areas were classifi ed with these methods [13]. In another study, HCA and PCA were applied using 10 chemical variables in 247 samples to classify groundwater [14]. River water quality was analysed in the Three Gorges area of China to investigate spatial and temporal variations along with identifi cation of potential pollution sources [15].…”

Section: Application Of Multivariate Statistical Methodsmentioning

confidence: 99%

Application of Multivariate Statistical Methods for Water Quality Assessment of Karasu-Sarmisakli Creeks and Kizilirmak River in Kayseri, Turkey

Özdemir¹

2016

Pol. J. Environ. Stud.

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Monitoring water quality of rivers has particular ecological, economic, and environmental importance for a region. However, long-term monitoring of a river network requires a large amount of analysis with high work load and cost. In this study, multivariate analysis was performed to decrease the number of parameters and sampling points for monitoring water quality in the Kızılırmak River and its southern ranches of Karasu and Sarmısaklı creeks. On the study area, water quality parameters were collected from seven sampling points for 2004-07 and 2010-14. Multivariate statistical analysis was performed by hierarchical cluster analysis and principal component analysis for the evaluation of parameter variations and dataset interpretation. The dataset was divided into periods A and B to evaluate the effects of seasonal changes on sampling points and parameters.

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“…All the arsenic values reported are below the MPL of 0.5 mg/L (MSB, 2005a). Generally, it has been observed that alluvial aquifers probably have high salinity values particularly in lower Shire valley, eastern Bwanje valley and around Lake Chilwa (Bath, 1980;Monjerezi et al, 2011). In contrast, low salinity values for groundwater from weathered basement in the Bua catchment of western Malawi are on record (Bath, 1980).…”

Section: Chemical Qualitymentioning

confidence: 99%

Basement and alluvial aquifers of Malawi: An overview of groundwater quality and policies

Mapoma¹,

Xie

2014

Afr. J. Environ. Sci. Technol.

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Hydro-geochemical processes in an area with saline groundwater in lower Shire River valley, Malawi: An integrated application of hierarchical cluster and principal component analyses

Cited by 96 publications

References 42 publications

Matching soil salinization and cropping systems in communally managed irrigation schemes

Matching soil salinization and cropping systems in communally managed irrigation schemes

Application of Multivariate Statistical Methods for Water Quality Assessment of Karasu-Sarmisakli Creeks and Kizilirmak River in Kayseri, Turkey

Basement and alluvial aquifers of Malawi: An overview of groundwater quality and policies

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