Two field experiments were carried Out during 2000 and 2001 seasons at the
Experimental Farm, Fac. of Agric. Moshiohor to study the effect of dual inoculation with Rhizobiurn sp (Mungbean strain) and VA-mycorrhizae (VAM) Glonius oggregatwn 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 Rhizobiuni and mycorrhizae gave higher records of mung bean nodulation, N2-ase activity and mycorrhizal root infection percentage com pared 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 in rhizos
phere were higher in rhizobial inoculated treatments than mycorrhizal inoculated
ones. Whereas, available phosphorus and CO2 evolution were higher in mycorrhizal inoculated treatments than rhizobial inoculated ones. Mungbean growth characters were significnatly increased in case of dual inoculation compared to individual in
oculation and this was true in the two growing seasons. Also, mungbean groih
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 mungbean 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 oculation gave the highest seed yield, biological yield and yield components as well as protein yield of mungbearى plants and this was obvious with zinc application (20ppm).
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