Hend M.A. El-Egami, Yasser A. El-Tahlawy and Soad Y.S. El-Sayed( 2017). ENHANCEMENT THE PRODUCTIVITY OF WHEAT BY IMPROVING THE EFFICIENCY OF NONSYMBIOTIC NITROGEN FIXING BACTERIA IN THE PRESENCE OF SOME BIOFERTILIZERSN. Egypt. J. Microbiol. Vol. 46, January, 2017.
Abstract: A field experiment was conducted at Ismaillia Experimental Research Station (ARC), Ismaillia Governorate, Egypt, during winter-growing season of 2015/16 to improve wheat (Triticum aestivum) growth, productivity and yield components by improving the efficiency of nonsymbiotic nitrogen fixing bacteria in the presence of some biofertilizers. Seeds of wheat (cv. Sakha-93) were divided into two parts, the first part was treated with nitrogen fixing bacteria (Bacillus polymyxa), while the second one untreated with nitrogen fixers. Each part was divided into four parts of biofertilizers (without biofertilizer, Serratia marscences, Trichoderma harizianum and mixture of Serratia marscences and Trichoderma harizianum) inoculated with gamma irradiated vermiculite-based inocula at a rate of 600g inoculant per 60 kg seeds fed-1 in the presence of three different levels of mineral nitrogen fertilizer (50, 75 and 100 percent of recommended dose). The obtained results showed that (1) Increasing application rates of mineral N-fertilizer was effected significantly on all wheat growth characters, yield and yield components. (2) There are significant increases in all wheat vegetative growth characters, yield and some yield components due to inoculation with B. polymyxa. However, (3) Mixture of T. harizianum and S. marscences treatment significantly surpassed the other biofertilization treatments. (4) Data showed significant interaction between different levels of mineral nitrogen fertilizer, inoculation with B. polymyxa and biofertilizers. The using of any biofertilizers, nitrogen fixer and 75% mineral-N fertilizer gave results nearly similar to those obtained by using of the full dose of recommended mineral N-fertilizer. Efficient use of interaction may be acting a good practice for improving soil fertility, wheat growth and yield characters and leading to reduce the chemical nitrogen fertilizer, to minimize the environmental pollution.
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