The present work was carried out on faba bean and wheat g:ops growing in
sandy loam highly calcareous soil and sandy soil at West Nubaria region during the
Winter seasons of 200012001 and 200112002, to study the effect of interactions
between mycorrhizal rung; (AM), phosphate dissolving bacteria (PO B) and Rhizobium
ieguminosarum biovar viceae (R) or Azotobac/ar chroococum (A) on growth, yield and
nutrient uptake by faba bean and wheat plants. The experiments were lied out in a
split-plot design with four replications. The main plots were for minera fertilizers (two
levels) and sub-plots were for inoculation treatments (eight inoculation treatments). The results dearly showed that Inoculation with Rhizobium feguminosarum
or Azotobacter chroococum singly or in combination with AM or poe and (AM + POS)
markedly enhanced the yield and all the measured yield components of faba bean
and wheat plants, as well as nutrients uptake by plants under calcareous and sandy
soil conditions compared to uninoculaled or inoculated plants by AM and poe alone
or the dual inoculation with (AM + POe). Nodulation of faba bean plants was positively
affected by inoculation with Rhizobium andlor any other inocula mixed with
Rhizobium. Faba bean and wheal dry weight was increased by abOut 25% due to
inoculation with mixtures of AM + R + poe or AM + A + POB as compared 10
uninoculated plants or any other inoculation treatment. Nitrogen uptake by inoculated faba bean and wheat plants 'th Rhizobium
and Azotobacter andlor their mixture with AM and poe was increas,d by 3.97 and
6.38%, with relative increase in seed yield by 11.28 and 3.72% as compared to
uninoculated or inoculated plants with AM or poe and (AM + POe) for calcareous soil,
respectively. While, It was increased by 8.95 and 44.1% with relative increase in seed
yield by 16.42 and 6.85% for sandy soil. Inoculation with mycorrhiza or phosphate
dissolving bacteria singly and with any of their combinations increased R-supply which
led to Improve P-uptake by faba bean and wheat plants as compared to uninoculated
or inoculated plants with Rhizobium and Azotobacter, it was Increased by 1.91 and
3.57% for calcareous soil and by 2.28 and 1.94% for sandy soli, respectively. In general, a highly response of faba bean or wheat plants to the inoculation
mixed was observed to be higher than that for single Inoculation for the ~o tested soil
types. This indicated that there was a positive interaction between he two andlor
three inocula for the welfare of faba bean and wheat plants.