Effect of free-living nitrogen fixing bacteria and nitrogen chemical fertilizer on yield components of corn (Zea mays L.)

In order to study the effects of free living nitrogen fixing bacteria and nitrogen chemical fertilizer on yield components of corn cultivar SC 647, a factorial experiment based on randomized complete block design with four replication was conducted at Varamin, Iran in 2010. The factors in this study included Azospirillum, Azotobacter and nitrogen chemical fertilizer. Azospirillum consisted of two levels (non application-application), Azotobacter consisted of two levels (non application-application) and nitrogen chemical fertilizer consisted of two levels (application of net nitrogen chemical fertilizer at the rate of 200 Kg ha-1 and application half of net nitrogen chemical fertilizer at the rate of 100 Kg ha-1. Results revealed that with application free-living nitrogen fixing bacteria with half rate nitrogen chemical fertilizer increased all of traits except seed number in row.