Morphology and properties of some extremely acid lowland soils in Southern Thailand
1993
Irb Kheoruenromne | Anchalee Suddhiprakarn | Attasit Wongmaneeroj (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Study on morphology and properties of some extremely acid lowland soils were carried out on three soils areas: Munoh series, Ra-ngae series and Thon Sai series in Narathiwat Province, southern Thailand. Method of soil characterization comprising pedon analysis and soil sample analysis based on standard method was applied. Results of the study revealed that the three soils possess a similar profile model and morphology wiht that of acid sulfate soils in the Central Plain. However, these three soils are more sandy (sandy clay loam to loamy sand), richer in organic matter content (6.2-72.1 g/kg) and markedly lower in available potassium (10-35 mg/kg) than most of the acid sulfate soils in the Central Plain are. The base reserves in these soils are very low whereas their extractable acidity is very high (up to 126.5 cmol/kg). The condition in these soils indicates a low buffering capacity and the effect of their acidity on crop cultivation is generally serious.
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