Proximal gamma-ray spectrometry for site-independent in situ prediction of soil texture on ten heterogeneous fields in Germany using support vector machines
Proximal gamma spectrometry as a tool soil texture prediction requires calibration. Linear calibration models failed when transferred between different sites. Mineralogy partly led to adverse relationships between gamma features and texture. Non-linear SVM based models yielded site-independent reliable texture predictions. Universal application of gamma spectrometry for precision farming is possible.