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United States Department of Agriculture

Agricultural Research Service

Title: Near-Infrared Spectroscopic Determination of Ammonia, Moisture, and Total Carbon and Nitrogen in Dairy Manures

item Reeves Iii, James
item Van Kessel, Jo Ann

Submitted to: Eastern Analytical Symposium
Publication Type: Abstract Only
Publication Acceptance Date: March 2, 2000
Publication Date: N/A

Technical Abstract: The objective of this study was to investigate the feasibility of using Near-Infrared Reflectance Spectroscopy to determine constituents of dairy manures related to the use of dairy manures as fertilizer. One hundred and seven diverse dairy manures, collected from dairy farms in the northeastern United States (CT, MD, NY, PA, VA) were assayed by conventional means and Near-Infrared Spectroscopy for total C, total N, NH3, moisture, P and K. Samples were scanned (64 co-added scans) from 400 to 2498 nm in polyethylene bags on a NIRSystems Model 6500 scanning monochromator equipped with a sample transport device. Calibrations were developed using a one-out cross validation procedure using Partial Least Squares Regression. Preliminary results showed that 8 samples were outliers due either to inaccurate conventional analysis or for being uncharacteristic (i.e., two samples had moisture contents below 72% while all others were above 78%). These were removed from further consideration. Final calibration results using the remaining 99 samples demonstrated that Near-Infrared Reflectance Spectroscopy can accurately determine the moisture (R2 = 0.945, RMSD = 1.0 %), total C (R2 = 0.950, RMSD = 0.40 %), total N (R2 = 0.956, RMSD = 0.030 %) and NH3 (R2 = 0.967, RMSD = 0.013 %), but not P or K contents of dairy manures. In conclusion, Near-Infrared Reflectance Spectroscopy was shown to be a viable alternative to conventional analysis procedures for determining moisture, total C, total N and NH3 in a very diverse set of dairy manures.

Last Modified: 5/5/2015
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