@article{fdi:010063278,
  title = {{D}etermination of total carbon and nitrogen content in a range of tropical soils using near infrared spectroscopy : influence of replication and sample grinding and drying},
  author = {{B}arth{\`e}s, {B}ernard and {B}runet, {D}idier and {F}errer, {H}enri and {C}hotte, {J}ean-{L}uc and {F}eller, {C}hristian},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ear infrared ({NIR}) reflectance spectroscopy has been receiving increased attention for the rapid and inexpensive determination of soil properties and of total carbon ({C}t) and nitrogen content ({N}t) in particular. {H}owever, methodological aspects such as sample grinding and drying or replication have not been addressed extensively. {T}he objectives of the paper were, thus, to assess how {NIR} predictions of {C}t and {N}t were affected by sample grinding (2 mm sieving vs. 0.2 mm grinding), drying (air-drying vs oven-drying at 40 degrees {C} during 24 h) and replication (use of one to six sub-samples to determine average spectra). {T}his was performed on a range of tropical soils that differed widely in mineralogy (low and high activity clay soils, allophanic soils) and texture (sandy to clayey). {T}he accuracy of the {NIR} predictions of {C}t and {N}t was higher with oven-dried compared to air-dried samples and, more markedly, with 0.2 mm ground compared to 2 mm sieved samples. {R}eplication had a positive effect on {NIR} predictions when 2 mm sieved samples were used, especially for air-dried samples, but this effect was not clear with 0.2 mm ground samples. {T}hus, the most accurate predictions of {C}t and {N}t were obtained with oven-dried finely ground samples, with limited response to sample replication. {A}ccurate predictions were, however, also obtained with four replicates on oven-dried 2 mm sieved samples. {A}cceptable and less tedious results could, thus, be achieved when replacing fine grinding by replication. {E}ven with this procedure, the r(2) between predicted ({NIR}) and measured (reference) values was 0.9 and the ratio of standard error of prediction to mean ({CV}%) was 20% which can be considered satisfactory for the heterogeneous sample set under study.},
  keywords = {soil ; carbon ; nitrogen ; near infrared {NIR} reflectance spectroscopy ; sample preparation ; replication},
  booktitle = {},
  journal = {{J}ournal of near {I}nfrared {S}pectroscopy},
  volume = {14},
  numero = {5},
  pages = {341--348},
  ISSN = {0967-0335},
  year = {2006},
  DOI = {10.1255/jnirs.686},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063278},
}