Raouf Seyed Sharifi1, Kazem Khavazi2 , Abdolghayoum Gholipouri
In order to evaluate the effects of seed priming with Plant Growth Promoting Rhizobacteria (PGPR) on dry matter accumulation and yield of maize (Zea mays L.) hybrids, A factorial experiment based on randomized complete block design with three replications was conducted in 2009 at the Research Farm of the Faculty of Agriculture University of Mohaghegh Ardabili. Factors were: seed priming with Plant Growth Promoting Rhizobacteria in three levels containing, without priming (as control), priming with Azotobacter, Azosprilium and Azotobacter+Azosprilium plus maize hybrids (SC-404, SC-410 and SC-434). The results showed that seed priming with Plant Growth Promoting Rhizobacteria affected grain yield, plant height, number of kernel per ear, number of grains per ear row significantly. Maximum of these characteristics were obtained by the plots which seeds were inoculated with Azotobacter bacteria. Mean comparison of treatment compound corn hybrids ?????various levels of priming with PGPR showed that maximum grain yield and number of kernel per ear were obtained by the plots which was applied SC-434 hybrid with Azotobacter bacteria and minimum of it was obtained in SC-404 hybrid without of seed priming. Investigation of process of variances of dry matter accumulation indicated that in all of hybrids, it increased slowly until 36 days after sowing and then increased rapidly till 116 days after sowing and from 116 days after sowing till harvest time, it decreased due to increasing aging of leaves. In additional, in all of maize hybrids, dry matter accumulation in unit of area increased with seed priming with Azotobacter. The highest grain yield (7.01 ton/ha) and dry matter accumulation (2019 gr /m2) was obtained in treatment compound SC-434 maize hybrid at seed priming with Azotobacter. Thus, it can be suggested that SC-434 hybrid should be inoculated with Azotobacter bacteria in conditions of Ardabil Plain.
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