Potential of selected soils under shifting cultivation in central highland, Thailand
1985
Prinya Saitham
A study on potential of soils at 7 locations under shifting cultivation practices was carried out in hilly areas of Amphoe Lom Kao, Petchabun Province using pedon analysis and semi-detailed survey methods. The areas had a range of elevation from 200-500 m MSL and their slopes range from 7 to 40 percent. Results of the study revealed that these soils showed characteristics those developed from residual and colluvial material derived from shale, mudstone, sandstone, some igneous and metasedimentary rocks. Most of these soils were shallow, well drained and having clayey texture with the presence of argillic horizon. Their surface layers had relatively high bulk density and evidence of erosion and deposition couild generally be observed on these soil surfaces. The soils had good chemical properties. They were high in organic matter whereas their total nitrogen, availabe potassium, exchangeable capacity were medium too high. Their available phosphorus values were low. These soils contained appreciable amount of kaolinite and vermiculite. Montmorillonite, illite and 14 A deg interlayered clay minerals found in minor quantities. Some primary weatherable minerals such as feldspars and micas were also present in small amount. Quartz was the major resistant mineral found. These soils were classified into Ultic Haplustalfs, Udic Paleustalfs, Lithic Haplustolls, Typic Haplustalfs, Ustalfic Argiustolls and Lithic Argiustolls according to soil taxonomy. These soils had medium fertile. They were moderately well suited for agronomic crops, tree crop production and pasture for livestock farming but unsuited for lowland paddy rice
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