I doubt ..Raman spectroscopy is an analytical method that can be employed in the laboratory using probes both for solid and liquid states, whilst portable Raman sensors for use in the field are also vailable described to measure P in soil.The main advantages of Raman measurements include the simple sample
preparation, the small amount of analytical material required and the fact that the resulting data can be used without any reprocessing. If the matrix is very heterogeneous and fluorescent substances are present, extraction steps can be undertaken to isolate the analyte. In pure systems, various band frequencies of different endmember elements (Ca, Cd, Pb– Sr) of hydroxyapatite can be identified. In soils, Raman spectroscopy was able to trace added hydroxyapatites at a submicron grain size and at concentrations down to 0.1% (w/w); this is below the routine detection limits of X-ray diffraction analysis (Lanfranco et al., 2003). Another advantage is the possibility to analyze aqueous solutions—owing to the very weak Raman scattering of water. Due to the excitation usinga laser beam, only a very small area of the probe is analyzed. Therefore, Raman spectroscopy can be combined with microscopic techniques (‘‘m-Raman’’). More inofrmation may be had from...Innovative methods in soil phosphorus research: A review,J. Plant Nutr. Soil Sci. 2015, 178, 43–88 DOI: 10.1002/jpln.201400327
Yes , soil sensors are available, but they can hardly replace the conventional methods of analysis. one of the limitations with soil nutrient sensors is the limits within which they work, but again , nutrients have to be extracted using certain defined extractants... There was a huge discussion on this issue with a title Soil Sensors ..on RG
Indeed the conventional methods are more precise is hardly replaceable. But everything depends on the precision sought and the objectives to be achieved.
Yes, it is possible. Raman is suitable for organic and anorganic compounds too. But N,S,P is better determine as nitrates, sulphates, phospates etc. or as minerals. It depend on what compounds do you focuse.
We are looking at soil NPK content , either in total concentration or in available index value...Lets know , which nutrient sensor precisely detects all these quantitatively
I think, you may go for Fibre Optic Sensor or Wireless Sensor Network (WSN). Please read the PDF attached for more details.
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