1. A method for predicting the soybean cyst nematode resistance of soybean genotypes comprising: (a) obtaining a spectroscopic scan of a soybean sample to provide an assay spectra over a predetermined frequency range; (b) comparing the assay spectra with a predictive model based upon corresponding spectra obtained over the predetermined frequency range from at least one base sample selected from the group consisting of known soybean cyst nematode resistant genotypes, known soybean cyst nematode susceptible genotypes, and combinations thereof to provide comparison results; and (c) predicting the soybean cyst nematode resistance of the soybean sample based upon the comparison results.