@article{fdi:010075126,
  title = {{P}erformance comparison between a miniaturized and a conventional near infrared reflectance ({NIR}) spectrometer for characterizing soil carbon and nitrogen},
  author = {{B}arth{\`e}s, {B}ernard and {K}ouakoua, {E}rnest and {C}lairotte, {M}. and {L}allemand, {J}. and {C}hapuis {L}ardy, {L}ydie and {R}abenarivo, {M}. and {R}oussel, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}iniaturized near infrared spectrometers are now available, at more affordable prices than conventional spectrometers, but their performances have been poorly studied to date. {T}his paper aimed at comparing the performances of the {JDSU} {M}icro{NIR} 2200 spectrophotometer (weight < 0.1 kg) with those of a conventional bench-top instrument for predicting carbon and nitrogen contents in laboratory conditions, on a range of representative {M}alagasy soils. {T}hough its noticeably narrower and less resolved spectra (1151-2186 nm at 8.15 nm step vs. 1100-2498 nm at 2 nm step), the microspectrometer yielded predictions in independent validation that were almost as accurate as those of the conventional instrument (standard errors of prediction were 4.6 vs. 3.4 g{C} kg(-1), but 3.9 vs. 3.4 g{C} kg(-1) after bias correction, and 0.36 vs. 0.35 g{N} kg(-1), respectively). {D}ue to noisy features, the {M}icro{NIR} spectra needed mathematical pretreatment (e.g. standard normal variate {SNV}), and bias correction for {C}, for providing accurate predictions, while the raw absorbance spectra from the conventional instrument did not. {F}urthermore, building multivariate models with {M}icro{NIR} spectra required less latent variables than with their conventional counterparts, and these models were less prone to performance degradation when applied to independent validation samples. {F}itting the spectra of the conventional instrument to those of the {M}icro{NIR} (1150-2182 nm at 2 or 8 nm step) showed that (moderately) less accurate {M}icro{NIR} predictions could be firstly attributed to narrower spectral range rather than to poorer resolution. {C}onsidering their performances, such microspectrometers could thus represent a cost-effective alternative to conventional spectrometers. {T}hey have now to be tested in field conditions.},
  keywords = {{N}ear infrared reflectance spectroscopy ({NIRS}) ; {S}oil organic carbon ; {S}oil total nitrogen ; {M}icrospectrometer ; {M}adagascar ; {MADAGASCAR}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {338},
  numero = {},
  pages = {422--429},
  ISSN = {0016-7061},
  year = {2019},
  DOI = {10.1016/j.geoderma.2018.12.031},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075126},
}