Abstract

Near infrared (NIR) reflectance spectroscopy was used to predict the content of silt, sand, clay, iron (Fe), copper (Cu), manganese (Mn) and zinc (Zn) in soil. A total of 332 samples from agricultural soils (0–15 cm depth) in Uruguay (South America) were used. The samples were scanned in a monochromator instrument (NIRSystems 6500, Silver Spring, MD, USA). Two mathematical treatments (first and second derivative) with SNVD (scatter normal variate and detrend) and without scatter correction were studied. Modified partial least squares (mPLS) was used to develop the calibration models. The coefficient of determination in calibration (R²_cal) and the standard error in calibration (SEC) using the second derivative were 0.81 (SEC: 5.1), 0.83 (SEC: 5.3), 0.92 (SEC: 2.6) for percent sand, silt and clay, respectively. The R²_cal and standard error of cross-validation (SECV) were for Cu 0.87 (SEC: 0.7), for Fe 0.92 (SEC: 21.7), for Mn 0.72 (SEC: 83.0) and for Zn 0.72 (SEC: 1.2) on mg kg⁻¹ dry matter. It was concluded that NIR reflectance spectroscopy has a great potential as an analytical method for routine analysis of soil texture, Fe, Zn and Cu due the speed and low cost of analysis.

© 2003 NIR Publications

Accurate and rapid detection of soil and fertilizer properties based on visible/near-infrared spectroscopy

Zhidan Lin, Rujing Wang, Yubing Wang, Liusan Wang, Cuiping Lu, Yang Liu, Zhengyong Zhang, and Likai Zhu
Appl. Opt. 57(18) D69-D73 (2018)

Combination of laser-induced fluorescence and diffuse-reflectance spectroscopy for the in situ analysis of Diesel-fuel-contaminated soils

Hans-Gerd Löhmannsröben and Lars Schober
Appl. Opt. 38(9) 1404-1410 (1999)

Spark-induced breakdown spectroscopy and multivariate analysis applied to the measurement of total carbon in soil

Morgan S. Schmidt, Kellen J. Sorauf, Keith E. Miller, David Sonnenfroh, Richard Wainner, and Amy J. R. Bauer
Appl. Opt. 51(7) B176-B182 (2012)

Optical properties of drying wood studied by time-resolved near-infrared spectroscopy

Keiji Konagaya, Tetsuya Inagaki, Ryunosuke Kitamura, and Satoru Tsuchikawa
Opt. Express 24(9) 9561-9573 (2016)

Laser ablation–laser induced breakdown spectroscopy for the measurement of total elemental concentration in soils

Jhon Pareja, Sebastian López, Daniel Jaramillo, David W. Hahn, and Alejandro Molina
Appl. Opt. 52(11) 2470-2477 (2013)