Effect of Azotobacter, Mycorrhiza and different nitrogen levels on yield and yield components of forage maize (KSC 704)

The experiment conducted in base on randomized completely block design with 3 replications in Markazi Agricultural Research Center that its، application effects of two level of biofertilizers، namely Azotobacter (with 2 kg/ha and without biofertilizer) and Mycorrhiza (with 0. 5 kg/ha and without mycorrhiza) and four levels of the nitrogen (0، 75، 150، 300 kg/ha) on seed number/ row، seed number/ear، ear weight (without cover)، ear diameter and fresh weight of the forage، evaluated. The results showed that Azotobacter caused significant increasing of the parameters such as: seed number/ear row (36. 03) number row/ear (486. 16)، ear weight (180. 8 g) and forage fresh weight (44. 4 ton/ha) but effect of Mycorrhiza on this characters was not significant. Application of Azotobacter (2kg/ha) and different levels of the Mycorrhiza together، caused significant increasing of seed number/row ear (36. 85)، ear weight (189. 35 g) and also fresh forage weight (49. 09 ton/ha). Intraction effects of Azotobacter، Mycorrhiza and nitrogen in mentioned characteristic were not significant. Results showed that effects of Azotobacter on fresh forage weight (44. 14 ton/ ha) by itself is equal to N2 level (150 kg/ha) have been efficiency. Therefore from economical point of view using Urea (150 kg/ha) with Azotobacter inoculums is recommended.