If noxious weeds are present, then usually strict limits are imposed as tolerance limits. Soil particles, broken seeds, awns and short stems are items included in the percent inert matter. The seed tag also bears information regarding the germination capability of the seed, which is tested under strict laboratory conditions for each species. Any fungicide treatments to the seed would be included here as well. This is the highest quality seed available.
Variety is worthy of certification, or describable by the originator.
Minimum standards for purity are met. Other grass contamination limits are met. These conditions when met, insure the buyer that the best quality seed is available to them. It is important to take into consideration the actual amount of seed which can be expected to germinate. Two components of information on the seed tag allow you to do this.