RESPONSE OF SOME CULTIVARS WHEAT (TRITICUM AESTIVUM L.) TREATED WITH AZOTOBACTER VINELANDII MUTANTS UNDER MINIA REGION CONDITIONS, EGYPT

This study aim evaluation response nine wheat cultivars to treat by with three strains of Azotobacter bacteria (Azotobacter wild type, histidineless and histidineless × threonineless) in two seasons 2020/2021 and 2021/2022. Results confirmed that, treated wheat cultivars by Azotobacter histidineless (M2) recorded the highest mean on growth characters: Plant height (104.05 and 106.40 cm), number of tillers/plant (9.43 and 9.74), spike length (11.11 and 11.10 cm), number of spikelets / spike (20.46 and 20.67), 1000 grain weight (56.41 and 56.81 g), biological yield (6.96 and 7.14 ton/fed) and harvest index (38.68 and 40.65%) in seasons 2020/2021 and 2021/2022, respectively. While Sakha 95 cultivar was recorded the highest all growth character means : plant height (106.30 and 107.33cm), number of tillers/plant (9.88 and 11.33) and spike length, but Misr 1 cultivars was recorded the lowest plant height (91.26 and 91.26 cm), number of tillers/plant (8.04 and 9.05) and spike length (9.01 and 9.05 cm), biological yield (7.48 and 6.84 ton/fed) and Harvest index (41.67 and 42.75%) in seasons 2020/2021 and 2021/2022, respectively. Finally, we can summarize the results to the treatment of Sakha 95 wheat cultivars by Azotobacter histidineless record the best yield of wheat.