Empirical model and variability of soil salinity in the coastal zone of Bangladesh

Authors : Md Shahadat Hossain, GKM Mustafizur Rahman, Md Saiful Alam, HA Mashuk, Md Mizanur Rahman

Pages : 144-151

Doi:10.18393/ejss.541344

View : 47 | Download : 13

Publication Date : 2019-04-01

Article Type : Research Paper

Abstract :Soil salinity expressed by electrical conductivity is a threat to crop production. The study aims were to establish relationships of electrical conductivity with its relevant soil properties, and analyze variability of soil salinity in the coastal zone of Bangladesh. A total of 150 geo-referenced saline soil samples from three coastal districts insert ignore into journalissuearticles values(Khulna, Satkhira and Bhola); of Bangladesh were analyzed for electrical conductivity of saturated paste extract insert ignore into journalissuearticles values(ECe);, salt cations and other soil properties related to salinity. Statistical and geostatistical analyses were done as required. Moderate to strong significant regression relationships insert ignore into journalissuearticles values(R 2 =0.42 to 0.94); were found between ECe and salt cations insert ignore into journalissuearticles values(ECe=43.12*Na 2 -46.36*Na+13.97; ECe=12.26*K-2.5;ECe=1.16*Ca-1.97; ECe=0.32*Mg 2 -1.60*Mg+3.53); of the soils. On the contrary, weak relationships insert ignore into journalissuearticles values(R 2 =0.05 to 0.21); were found between ECe and other soil properties insert ignore into journalissuearticles values(ECe=4.41*organic carbon-0.56; ECe=-1.71*Txw insert ignore into journalissuearticles values(soil texture);+3.98;ECe=0.35*cation exchange capacity-1.98; ECe=0.06*specific surface area-0.55);. Khulna soils insert ignore into journalissuearticles values(CV=65.99%); showed lower statistical variations while Satkhira insert ignore into journalissuearticles values(CV=97%); and Bhola insert ignore into journalissuearticles values(CV=105%); soils showed higher statistical variations for ECe. In contrast, Khulna, Satkhira and Bhola soils showed strong, moderate and weak spatial dependency for ECe, respectively. Interpolated spatial distribution maps of ECe showed variations in individual districts of study areas. The findings would assist soil scientists or farm managers to understand and/or manage saline soils, specially the soils of coastal zone of Bangladesh.
Keywords : Geostatistics, electrical conductivity, map, relationship, soil property

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