Management,practices such as tillage, residue management, rotation, and fertilization not only influence SOC quality but also alter SOC quantity and the vertical distribution in the soil profile (Angers et al. 1997). Consequently, methods to characterize SOC are necessary to achieve a better understanding of the nature and dynamics of SOC (Denef et al. 2009). Near-infrared and MIR diffuse reflectance spectroscopy have increasingly been used to determine numerous soil properties over the past two decades (Janik et al. 1998; Cozzolino and Moro´ n 2006; Viscarra Rossel et al. 2006; Zimmermann et al. 2007; Minasny and McBratney 2008; Vasques et al. 2009). Compared with conventional methods, NIR and MIR spectroscopy techniques are characterized as time- and cost-efficient, non-destructive, and they do not require any reagents for analysis (Shepherd and Walsh 2002; McBratney et al. 2006; Vasques et al. 2008; Zornoza et al. 2008).
This review can inform the importance of infrared spectroscopy techniques to better estimation of carbon managements. now i am just confused to using it in analysis, sample preparation will be sample as other conventional methods or different.
Kindly suggest me
Dear Kashif Ali Kubar
It depends which kind of technique you would like to perform
NIR spectra collection can be either on the field (usualy with a spectrometer equiped with a fiber) or in the lab.
In the first case there will be no or little preparation
In the second case you should rather dry the samples and sieve it threw a 2 mm mesh. Man can also grind it to reduce the effect of particle size
Best regards
Damien
Dear Kashif Ali Kubar,
I would consider also whether the aim is to correlate the absorbances with TOC content, or also characterizing the SOM composition in terms of functional groups, is of importance. We had a positive experience to examine, by means of MIR, the band intensity ratios, to learn about the treated wastewater irrigation effect on SOM composition.In that case, the traditional transmission experiment was used, with KBr pellets of the whole soil samples. The bands were well measurable but, as Damien Ertlen noted, drying was important, as well as preparing the KBr pellets was also the procedure needed ceratin efforts. Perhaps, DRIFT (or ATR?) could be more easy to use, photoacoustic detector?
Thanks Dr Damien Ertlen, Dr Abebe Shiferaw, Dr Mikhail Boricover for your kind response and nice suggestion. yes I am agree with your points that I have need to do both spectral measurements and wet digestion analysis also then correlate spectral measurements with TOC data. am i right?
In deed!
But you can construct your model from a small set. (both digestion and spectra) typicaly with statistic like partial lest square (PLS) and than predict the % of C of a large set only from spectra. The size of the set to construct the model depend of the heterogenity of your samples and the range of your data and also the precision you expect!
Best regards
D
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