irie ▁grass es ▁can ▁be ▁grown ▁in ▁infer t ile ▁soil , ▁elimin ating ▁the ▁cost ▁of ▁adding ▁nut ri ents ▁to ▁the ▁soil . ▁T il man ▁and ▁his ▁colle agues ▁estimate ▁that ▁pra irie ▁grass ▁bio fu els ▁would ▁yield ▁ 5 1 ▁percent ▁more ▁energy ▁per ▁a cre ▁than ▁eth an ol ▁from ▁corn ▁grown ▁on ▁fert ile ▁land . ▁Some ▁plants ▁commonly ▁used ▁are ▁l up ine , ▁big ▁bl uest em ▁( t ur key ▁foot ), ▁bla zing ▁star , ▁switch gr ass , ▁and ▁pra irie ▁clo ver . ▁ ▁Pres ervation ▁ ▁Because ▁rich ▁and ▁thick ▁to ps o il ▁made ▁the ▁land ▁well ▁su ited ▁for ▁agricult ural ▁use , ▁only ▁ 1 % ▁of ▁tall gr ass ▁pra irie ▁remains ▁in ▁the ▁U . S . ▁today . ▁Short ▁grass ▁pra irie ▁is ▁more ▁abund ant . ▁ ▁Sign ific ant ▁preserved ▁areas ▁of ▁pra irie ▁include : ▁ ▁Ald er ville ▁Black ▁Oak ▁Sav anna ; ▁R ice ▁Lake , ▁Ontario ▁ ▁American ▁Pra irie ▁Foundation ▁( American ▁Pra irie ▁Reserve ), ▁Phill ips ▁and ▁Bla ine ▁count ies , ▁Mont ana ▁ ▁Cer es co ▁Pra irie ▁Conserv ancy , ▁R ip on ▁College , ▁Wisconsin ▁ ▁C ly mer ▁M ead ow ▁Pres erve , ▁H unt ▁County , ▁Texas ▁ ▁Cy press ▁Hills ▁Inter pro vin cial ▁Park , ▁Al berta ▁and ▁S ask atch ew an ▁ ▁Gr ass lands ▁National ▁Park , ▁S ask atch ew an