Assessment of spatial variability in some soil properties as related to soil salinity and alkalinity in Bafra plain in northern Turkey |
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Authors: | Bilal Cemek Mustafa GÜLer Kenan KiliÇ Yusuf Demir Hakan Arslan |
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Institution: | (1) Department of Agricultural Structures and Irrigation,Faculty of Agriculture, University of Gaziosmanpaşa, 60240 Tokat, Turkey;(2) Karadeniz Agricultural Research Institute,Gelemen, Samsun, Turkey;(3) Department of Soil Science, Faculty of Agriculture, University of Gaziosmanpaşa, 60240 Tokat, Turkey;(4) Department of Agricultural Structures and Irrigation,Faculty of Agriculture, University of 19 May, Samsun, Turkey;(5) XI. Regional Directorate of State Water Works,Bafra, Samsun, Turkey |
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Abstract: | The objectives of this study were to assess the variability in soil properties affecting salinity and alkalinity, and to analyze
spatial distribution patterns of salinity (EC) and alkalinity (ESP) in the plain, which was used irrigation agriculture with
low quality waters. Soil samples were collected from 0–30cm, 30–60cm, 60–90cm and 90–120cm soil depths at 60 sampling sites.
Soil pH had the minimum variability, and hydraulic conductivity (Ks) had the maximum variability at all depths. The mean values
of pH, EC, ESP and Ks increased while the mean values of CEC decreased with soil depth. Values pH, EC and ESP were generally
high in the east and northeastern sides. Soil properties indicated moderate to strong spatial dependence. ESP and pH were
moderately spatially dependent for three of the four depths, EC exhibited moderate spatial dependence for one of the four
depths, CEC had a moderate spatial dependence at all depths, and Ks exhibited a strong spatial dependence. EC, CEC, and ESP
were considerably variable in small distances. The spatial variability in small distances of EC, CEC, pH and ESP generally
increased with depth. All geostatistical range values were greater than 1230m. It was inferred that the strong spatial dependency
of soil properties would be resulted in extrinsic factors such as ground water level, drainage, irrigation systems and microtopography. |
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Keywords: | Spatial variability Geostatistics Bafra plain Soil salinity |
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