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This NebGuide discusses weed seed entry and loss from the soil, and provides examples of the density and diversity of the soil weed seed population. Weed Seed in the Soil Most weeds owe their beginning to seed in the soil. The soil acts as a seed storage reservoir and a growth medium for weedy plants. The kind or species and numbers of seed in the soil is closely linked to the cropping history of the land. Grasslands contain seed associated with grassland plants and cropland contains seed affiliated with weeds growing on cultivated land. Grasslands that have been cultivated and then reseeded to grasses generally contain mixed weed populations.