| nitrogen fixation (acetylene reduction) associated with roots of winter wheat and sorghum in nebraska. | root segments and root-soil cores (6.5-cm diameter) from fields and nurseries of winter wheat and sorghum were tested for n2 fixation by using the acetylene reduction assay. wheat samples (approximately 1,200) from 109 sites generally had low or no activity (0 to 3.1 nmol of c2h4 produced per h per g [dry weight] of root segments), even after 24 h of incubation. however, a commercial field of scout 66, located in western nebraska, exhibited appreciable activity (290 nmol of c2h4 produced per h p ... | 1978 | 623458 |