'Field Crops Research Institute, ARC, Egypt
2Soil, Water, and Environment Research Institute, ARC, Egypt
The objective of this work was to study the effect of chemical N fertilizer 50% reduction combined with different nitrogen-fixing bacteria on wheat grain yield compared to applying the recommended N fertilizer (100%). One field and three pot experiments were conducted in sandy and clay-loamy soil. The results of pot experiment I indicated that seed inoculation with Herbaspirillum plus 50% N fertilizer gave the highest grain yield and did not significantly differ from the 100% N fertilizer treatment. The results of pot experiment II showed that seed inoculation with certain double inoculants in addition to 50% N fertilizer did not significantly differ from the 100%o N fertilizer control treatment. Pot experiment III results depicted that under either sandy or clay soil conditions certain wheat seed double inoculation treatments gave similar results as mentioned above. The field experiment showed that the highest significant seed inoculation treatment in grain yield was 50% N fertilizer + Azospirillum SP 7 + Herbaspirillum in sandy soil while 50% N fertilizer + Azorhizobium ORS 571 + Herbaspirillum in clay soil. It could be concluded from this study that seed inoculation treatment with nitrogen-fixing bacteria could satisfy about 50%o of N requirement for wheat.
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