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The study was carried out to derive pedotransfer (PTFs) and spectrotransfer (STF) functions to estimate soil organic matter (SOM) content measured by time-consuming and expensive Walkley–Black wet combustion (W-B), using SOM content obtained from loss on ignition (LOI) and spectra reflectance bands at visible (Vis) and near infrared (NIR) regions. In total, 171 soil samples were collected from calcareous soils of southern Iran. The SOM content of the samples was determined using W–B wet combustion (SOM W-B ) and LOI at temperatures of 360 °C during 2 h (LOI 360-2 ); 550 °C during 3 h (LOI 550-3 ); and 375°C during 16 h (LOI 375-16 ). For the spectroscopy method, partial least squares regression (Spect PLSR ) and forward stepwise multiple linear regression (Spect SMLR ) approaches were used for function development. The LOI 360-2  procedure with R 2val  of 0.9 for the validation dataset provided the best match with SOM W-B  content. Furthermore, the Spect SMLR  provided a STF using spectral reflectance bands at 495, 730, 970, 1906, 2262 and 2342 nm which predicted SOM W-B  with R 2val  of 0.87. Results indicated both the Spect SMLR  and LOI 360-2 , as easy and inexpensive approaches, could be recommended to accurately assess SOM content of calcareous soils.

Vis-NIR-spectroscopy- and loss-on-ignition-based functions to estimate organic matter content of calcareous soils