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State grass Scientific name Image Year adopted California: Purple needlegrass: Nassella pulchra: 2004 [1] Colorado: Blue grama: Bouteloua gracilis: 1987 [2] Illinois: Big bluestem (state prairie grass) Andropogon gerardii: 1989 [3] Kansas: Little bluestem: Schizachyrium scoparium (Andropogon scoparius) 2010 [4] Minnesota: Wild rice (state grain ...
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B Poor: <50% ground cover; Fair: 50-75% ground cover; Good: >75% ground cover. C Actual curve number is less than 30; use CN = 30 for runoff computation. D CN's shown were computed for areas with 50% woods and 50% grass (pasture) cover. Other combinations of conditions may be computed from the CN's for woods and pasture.
Technically, prairies have less than 5–11% [clarification needed] tree cover. [citation needed] A grass-dominated plant community with 10–49% tree cover is a savanna. After the steel plow was invented by John Deere in 1833, [8] this fertile soil became one of America's most important resources. Over 95% of the original tallgrass prairie is ...
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