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Perennial grass establishment on abandoned cropland in the Nebraska Sandhills is difficult due to low soil fertility, organic matter, and water holding capacity and high potent&l erodibhity. Establishment is further complicated by unpredictable predpitation and weed competition. Two warm-season grasses: sand bluestem [Au&opogon gcrrvdzl var. pauc&ti (Nash) Fem.] and switchgrass (Pa&awn virgatum L.); and 2 cool-season grasses: smooth brome (&O~WS irsermis Leyss.) and lntermedlate wheatpass [Thinopymm intcrmcdhm (Host) Rarkw. & D.R. Dewey subsp. iutermufium~were evaluated wlth spring-seeded field trials. Seedbed preparation [untilkxJ, disced, and dead oat (A veua s&vu L.) cover (DOC)] effect on seeded grass and nonseeded species densities was evaluated in 1985 and 1986 at 2 locations on Valentine sands (Aquic Ustipsamment). In 1985 1 site was irrigated. Both sites were dryland in 1986. Stand faihtre (< 5 seedlings/mr) occurred on the dryland site in 1985 due to low, erratic precipitation. Stands evahtated in June 1986 on plots established with irrigation in 1985 had 38,46, and 61 plants/mr for the untilled, disced, and DOC seedbeds, respectively. The disced or DOC seedbeds were required for successful @lo plants/mr) dryland seedings in 1986 at both locations. Irrigation the establishment year minhnized risk of stand failure and allowed the use of any seedbed preparation or grass species studied. Sand bluestem was the only species to establish both years. However, if a dryland seeding of a cool-season species is desired, intermediate wheatgrass appeared more adapted than smooth brome.

Seedbed Effects on Grass Establishment on Abandoned Nebraska Sandhills Cropland