Impact of shrimp farming on mangrove soil properties at Amphoe Kanchanadit, Changwat Surat Thani
1992
Chada Narongrit
Impact study of shrimp farming on mangrove soil properties was conducted at Surat Thani. Three sites of pond soil samples; dike, slopes of the dike and bottom; were analysed and assessed for fertility status. The data were also compared to nearby natural mangrove soil properties. The mangrove subsoil showed relatively higher chemical properties than surface soils. Their textures are generally clay. The soil reaction ranges from strongly acid to slightly acid. Electric conductivity ranges from medium to high. Organic matter, available potassium and base saturation are very high throughout the profile whereas their available phosphorus is high to very high and cation exchange capacity is high. In general, these soils have high fertility status. The pond soils have the wide range of chemical analytical values and vary more than the undisturbed mangrove soils. Their textures are generally clay. The soil reaction ranges from extremely acid to slightly alkali. Electric conductivity ranges from very low to high. Organic matter content ranges from very low to very high. Available phosphorus ranges from medium to very high. Cation exchange capacity value ranges from moderately low to high whereas available potassium and base saturation are very high throughout the profile. These soil have fertility status ranges from medium to high. In general the fertility statuses of pond soils are lower than the mangrove soil
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