Described are methods for determining a distribution of agricultural grit and for the color selection of a used adhesive mat and a corresponding adhesive mat. Accordingly, grit is collected on a collecting surface of at least one adhesive mat and determines the distribution of the grit by means of image analysis. Characterized in that the collecting surface has a hue that differs from a hue of the grit in the HSI / HSL / HSV color space by a color angle of at least 20 °, in particular at least 40 °, is a reliable detection and quantification of the grit on the collecting surface For a variety of fertilizer types and in different light conditions possible.
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