From basic texture and molecular orientations, to organic and in organic compositions, for proper analysis which spectrometer would be preferred for in field as well as in laboratory tests.
I think UV-VIS Spectrophotometer will do the job, for micronutrients you may use AAS. People are also using ICPMS or ICPOES for measuring the concentration in ppb level.
Near Infrared spectroscopy is the best method to the analysis of soil in situ as well as in vitro condition.
For further clarification you can see this attached link, it may be helpful
https://www.asdi.com/solutions/agriculture/soil-analysis
https://elibrary.asabe.org/abstract.asp?aid=28329
Thanks a lot, J.C. sir and Shivani mam... an important thing I wanted to mention is that I need to do this analysis in field with an automated robotic arm and send the feedback to communication modules, so can you please suggest me with the same? I have found many research papers regarding this and still a bit confused... and if possible can you add your email so that I could directly ask you in person.
Thanks and regards
Spectroradiometer may be the ideal choice, however before this soil spectral library needs to be developed to correlate with the field values and communicate the results to the user for proper interpretation
The ISO standardized method mayby could help you : this is a collection of well-establised process. Se the link above :
https://www.iso.org/committee/54346/x/catalogue/
IR spectroscopy is the technique, but Surendran made the critical suggestion: unless the soils are very similar or you only need very approximate results, you will need hundreds of conventionally tested samples for calibration.
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