02340naa a2200241 a 450000100080000000500110000800800410001902200390006002400350009910000140013424501480014826000090029650001000030552014820040565300300188765300110191765300130192865300150194165300090195665300120196570000180197777301030199510033562019-01-25       2007    bl uuuu     u00u1 u    #d  aprint 0010-3624 / 1532-2416 online7 a10.1080/001036207015484982DOI1 aMORON, A.  aMeasurement of phosphorus in soils by near infrared reflectance spectroscopybeffect of reference method on calibration.h[electronic resource]  c2007  aArticle history: Received 17 May 2006 // Accepted 04 Dec 2006 // Published online: 04 Sep 2007.  aABSTRACT. The use of ultraviolet (UV), visible (VIS), near infrared reflectance (NIR), and midinfrared (MIR) spectroscopy techniques have been found to be successful in determining the concentration of several chemical properties in soils. The aim of this study was to evaluate the effect of two reference methods, namely Bray and Resins, on the VIS and NIR calibrations to predict phosphorus in soil samples. Two hundred (n=200) soil samples were taken in different years from different locations across Uruguay with different physical and chemical characteristics due to different soil types and management. Soil samples were analyzed by two reference methods (Bray and Resins) and scanned using an NIR spectrophotometer (NIRSystems 6500). Partial least square (PLS) calibration models between reference data and NIR data were developed using cross‐validation. The coefficient of determination in calibration (R2) and the root mean square of the cross validation (RMSECV) were 0.58 (RMSECV: 3.78 mg kg−1) and 0.61 (RMSECV: 2.01 mg kg−1) for phosphorus (P) analyzed by Bray and Resins methods, respectively, using the VIS and NIR regions. The R2 and RMSECV for P using the NIR region were 0.50 (RMSECV: 3.78 mg kg−1) and 0.58 (RMSECV: 2.01 mg kg−1). This study suggested that differences in accuracy and prediction depend on the method of reference used to develop an NIR calibration for the measurement of P in soil. @Taylor & Francis Group, LLC  aNEAR INFRARED REFLECTANCE  aP-BRAY  aP-RESINS  aPHOSPHORUS  aSOIL  aVISIBLE1 aCOZZOLINO, D.  tCommunications in Soil Science and Plant Analysis, 2007, volume 38, Issue 15-16, pages 1965-1974 .