Soil and Plant Nutrient Analysis with a Portable XRF Probe Using a Single Calibration

A portable X-ray fluorescence probe (pXRF) is a tool that used to measure many elements quickly and efficiently in various samples, without any pretreatment. However, each type of sample generally requires different calibrations be accurate. To overcome this, our work evaluated the efficacy determining several forage plant samples using ‘Soil Nutrient Metal’ calibration commercially available pXRF probe, envisioning single can matrixes. For net intensity was determined place concentration values are obtained directly from measurements. Elemental concentrations (P, K, Ca, Mg, S, Cu, Fe, Zn, Mn) collected across Oklahoma, US, were assessed representative number ‘modeling’ ‘validation’ (independent dataset) samples. Linear regression (LR) associated with d-index, polynomial (PR), power (PwR) tested for predictions, producing statistical parameters models comparison goals. The elemental data provided highly reliable predictions Mn regardless model. Although all prediction Ca Fe concentrations, PwR better root mean square error (RMSE) values. Mg less reliable, although significant; however, P Cu not acceptable. Our successfully showed that, once established, curve covers wide range soils tissues enables both soil analyzed. This suggests manufacturers develop new model variety heterogeneous