Submitted to: ASAE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: 7/30/2003
Publication Date: 7/30/2003
Citation: CHRISTY, C.D., DRUMMOND, P., LAIRD, D.A. AN ON-THE-GO SPECTAL REFLECTANCE SENSOR FOR SOIL. ASAE ANNUAL INTERNATIONAL MEETING. 2003. AVAILABLE FROM: http://www.asae.org/pubs.
Technical Abstract: Laboratory based near infrared spectroscopy (NIRS)has demonstrated good predictive capability for many important soil constituents. Less is known about the feasibility of performing the spectroscopic measurements in a field setting. This paper presents some results of an initial field test of a mobilized in-situ NIRS device. The results demonstrate good pass-to-pass repeatability and meaningful qualitative images. Locally weighted principal component regression was used to develop calibration models relating the reflectance data to levels of soil organic carbon, nitrogen, moisture, and pH. The calibrations were used to create constituent maps for a field in central Iowa and compared to images derived from intensive sampling and laboratory analysis.