1. A method for classifying sugar-beet seeds, comprising the steps of a. measuring an IR-spectrum of each seed, b. classifying seeds according to their IR-spectrum yielding at least two seed classes, c. sorting said classes of seeds yielding at least two sorted fractions of seeds which respectively differ from each other by a quality of composition, wherein said quality of composition is reflected in a specific IR-spectrum, wherein the sugar beet seed is classified according to one of the classes “no free space”, “free space 1”, “free space 2” and “free space 3” of the “free space” present in the sugar beet seed, wherein the first seed-class differs from the at least one other seed-class by a quality of composition, wherein the quality of composition is the functional quality of “field emergence characteristic” present in the sugar beet seed, wherein the quality of “field emergence characteristic” correlates with the quality of “free space” present in the sugar beet seed, and wherein said quality of composition is reflected in a specific IR-spectrum.