Two field experiments were carried out during 2000 and 2001 seasons at the Experimental Farm, Fac. of Agric. Moshtohor to study the effect of dual inoculation with Rhizobium sp (Mungbean strain) and VA-mycorrhizae (VAM) Glomus aggregatum in presence of zinc application on nodulation, N2-ase activity, mycorrhizal root infection, growth and yield of mungbean plants. Results of this study showed that dual inoculation with Rhizobium and mycorrhizae gave higher records of mung bean nodulation, N2-ase activity and mycorrhizal root infection percentage compared to individual inoculation with either Rhizobium or mycorrhizae. All tested parameters were increased with zinc foliar application especially when zinc was sprayed in a concentration of 20 ppm. Ammoniacal and nitrate nitrogen inrhizosphere were higher in rhizobial inoculated treatments than mycorrhizal inoculated ones. Whereas, available phosphorus and C02 evolution were higher in mycorrhizal inoculated treatments than rhizobial inoculated ones. Mung bean growth characters were significantly increased in case of dual inoculation compared to individual inoculation and this was true in the two growing seasons. Also, mung bean growth characters were improved with zinc application either at 10 or 20 ppm as compared with no zinc application. The highest records of macro and micro-nutrients content (N,P and K) and (Fe, Zn and Cu), respectively in mung bean shoots were observed with dual inoculation and zinc application at 20 ppm. Also, macro and micro¬nutrients content was higher during flowering stage than vegetative one. Dual in¬inoculation gave the highest seed yield, biological yield and yield components as well as protein yield of mung bean plants and this was obvious with zinc application (20 ppm). |
