Characteristics, Properties and Productivity Potential of Thap Phrik Soil Series in Sa Kaeo Province
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Abstract
The determination of characteristics, properties of tentative Thap Phrik soil series is necessary for the establishment of the soil series and their boundaries in the soil map for effective land-use planning. Thus, the objectives were to analyze morphological, physicochemical, mineralogical properties and to assess their agricultural potential. Seven representative pedons in Sa Kaeo province were investigated. The results revealed that the Thap Phrik pedons in Sa Kaeo province are developing on erosional surfaces of weathered greywacke, shale, and limestone rocks. These soils are moderately developed, deep to very deep soil profile, and moderately well-drained. Rock fragments and the concretion of secondary lime were found in the soil profile. The soil texture of topsoils is clay, while the soil texture of subsoils is sandy clay to gravelly clay. The bulk density of soils ranges from low to high. Soil pH ranges from slightly acid to strongly alkaline. Soil organic matter content ranges from very low to moderately high. The studied soils have a very low content of total nitrogen, very low to moderately high contents of available phosphorus and potassium, moderately low to very high levels of cation exchange capacity, moderate to very high levels of extractable bases with base saturation percentages ranging from high to very high and very low to moderate levels of extractable acidity. All studied soils have moderate fertility status, and their fertility capability classes are Cdbp, Cbp, and Cdp, which their significant limitations are low available phosphorous (p) and strongly alkaline (b). The studied soils are moderately suitable for upland crops due to the accumulation of secondary lime concretion in subsoils and the risk of water shortage during the dry season. The overall agricultural potential of the studied soils is moderate.
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