“Conditioning” means drying, cleaning, scarifying or blending to obtain uniform quality, and other operations which would change the purity or germination of the seed and therefore require retesting to determine the quality of the seed, but does not include operations such as packaging, labeling, blending together of uniform lots of the same kind of variety without cleaning, or the preparation of a mixture without cleaning, and of which would not require retesting to determine the quality of the seed.