The main objective of this scientific paper was to study the influence of forages samples particles size on the determination of total nitrogen content (TNC) by NIR Spectroscopy. For this, correlations were realized between the values obtained for TNC using classical Kjeldahl method and the minimum reflectance values for four frequencies from NIR spectra. We used two particles sizes for forage samples: bulk (sieve with 1 mm diameter) and fine (sieve with 0.3 mm diameter). The correlation coefficient R 2 obtained for regression equation of bulk particles size was equal with 0.8212, smaller than that for fine particles size R²=0.90542092. It is possible to observe that the usage of fine particles size improves significantly the correlation coefficient R 2 of regression equation.

total nitrogen content; NIR Spectroscopy; forages

Presentation: oral