HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Sørensen, L. K. Articles by Birkmose, T. S. Search for Related Content PubMed Articles by Sørensen, L. K. Articles by Birkmose, T. S. Agricola Articles by Sørensen, L. K. Articles by Birkmose, T. S. Related Collections Soil Analysis Animal Waste

NUTRIENT MANAGEMENT & SOIL & PLANT ANALYSIS

Application of Reflectance Near Infrared Spectroscopy for Animal Slurry Analyses

^a Eurofins–Steins Laboratorium, Ladelundvej 85, 6600 Vejen, Denmark
^b Univ. of Aarhus, Faculty of Agricultural Sciences, Dep. of Agroecology, P.O. Box 50, 8830 Tjele, Denmark
^c Danish Agricultural Advisory Service, Udkærsvej 15, 8200 Aarhus N, Denmark

^* Corresponding author (lks{at}steins.dk).

The feasibility of using near infrared spectroscopy (NIRS) for rapid prediction of the composition of cattle and pig slurries was investigated. Samples with a total solids content from <1 to 15% were collected during a 3-yr period and used for calibration and validation. Test samples were sealed in plastic bags and measured in a sample cell moved vertically during measurements. Reflectance data in the range 1200 to 2400 nm were used for calibration based on partial least square regression. Dry matter (DM), N, NH₄–N, and P could be determined with r² values of 0.97, 0.94, 0.92, and 0.87, respectively. The ratios between analyte variation range standard deviation and the root mean square error of prediction (RMSEP) obtained on a calibration independent test set were 6.2 (DM), 4.3 (N), 3.8 (NH₄–N), and 3.6 (P). Total C and plant-available N (PAN) could be determined by near infrared spectroscopy with r² values of 0.94 and 0.89, but the same correlation was obtained by calculation from DM and NH₄–N results, respectively. The applicability of NIRS for K, Mg, Ca, Na, S, Cu, and Zn analysis was also investigated. The r² values were in the range 0.41 to 0.82, with the poorest results for Na, Zn, and K. The corresponding SD/RMSEP ratios were in the range 1.2 to 3.5. We concluded that the applied NIRS methodology is suitable for rapid routine analysis of DM, C, N, NH₄–N, P, and PAN in both cattle and pig slurries.

Abbreviations: DM, dry matter • NIR, near infrared • NIRS, near infrared spectroscopy • PAN, plant-available nitrogen • PLS, partial least squares • RMSECV, root mean square error of cross-validation • RMSEP, root mean square error of prediction • SEP, standard error of prediction