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This study evaluated the effectiveness of dry ashing of soils and subsequent spectral subtraction procedure in comparison with alternative chemical methods in accentuating organics for diffuse reflectance infrared Fourier transform (DRIFT) spectroscopic analysis of soil organic matter composition. Chemical oxidation of soil with sodium hypochlorite (NaOCl) and demineralisation by hydrofluoric acid...
Lime is commonly applied on agricultural lands for ameliorating soil acidity. However, lime dissolution and its concomitant contribution to carbon dioxide (CO 2 ) fluxes with the addition of organic residues at varying temperatures in acidic soils are not well known. We conducted laboratory incubation experiments for 96days (20+/−1°C and 40+/−1°C) to quantify the priming effects of lime (0...
There is a limited knowledge on the role of soil texture and clay mineralogy in governing the content and composition of organic matter (OM) associated with physically-separated fractions in major Thai soils. To extend the understanding in this context, we sampled a range of Thai soils representing four major mineralogy groups, i.e. siliceous, mixed mineralogy, kaolinitc, and smectitic soils. The...
Kaolinite is the major clay mineral in many Thai soils and the charge characteristics of soil kaolinites have not been properly evaluated. Soil samples from sub-soil horizons of fourteen Oxisols and Ultisols from Thailand were taken for this study. Clay fractions were separated from the soils, and free iron oxides and organic matter were removed to obtain soil kaolinites. Surface charge properties...
Rapid prediction of properties to describe soil variability is essential for site-specific crop management. Accurate predictions require the collection and analysis of a large number of soil samples, which is laborious and costly, and sometimes impossible. On the other hand, the diffuse reflectance spectrum of a soil sample provides multivariate data that are often related to various physical and...
This paper compares the mineralogical and chemical composition, morphology and strength of co-existing matrix, mottles, weak glaebules and strong dense glaebules in some soils from south-western Australia. The mineralogy and morphology of mottles and weak glaebules are very similar to soil matrix, whereas most dense glaebules differ substantially from the soil matrix. These dense glaebules are very...
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