Determination of organic matter contents and pH values of soil using near infrared spectroscopy

The aim of this study is to investigate the potential of the near infrared spectroscopy technique for non-destructive measurement of soil organic matter (OM) contents and pH values to meet the needs of precision farming. Spectral properties of 90 simply treated soil samples were analyzed. The quantitative analysis models were founded to determine the OM contents and pH values. The correlation coefficients are 0.818 and 0.834, standard errors of prediction are 0.069 and 0.095, and root mean standard errors of prediction are 0.085 and 0.114, respectively. The results show that it can predict OM contents and pH values commendably with the first derivate spectra. This research lays the basis for field experiment by using infrared spectroscopy technique to fast measure soil OM contents and pH values.