A field experiment was carried out for two winter seasons 2003/2004 and
2004/2005 in sandy soil under the inoculation with solubilizing bacteria
(Bacillus.megatherium). Spilt-split plot design was used where two phosphorus
sources (rock phosphate, RP, and super phosphorus, SP), two P fertilizer rates (75 kg
P20S fed-¹ and 150 kg P20S fed") and two rates of farmyard manure, FYM, (10m³ fed-
1 and 15m³ fed"). All plot of experiments were foliar treated with either FeS04 or Fe-
EDTA . . At flowering stage, results showed that photosynthetic pigment (chlorophyll a
(Chi a), chlorophyll b (Chi b) and carotene ,Car) contents of wheat leaves were
superior when 15m³ fed-¹ FYM was applied as compared to 10m³ FYM . Also
inoculation with B.megatherium positively affected Chi a,Chl b and Car as compared
to non inoculation. The highest values of chlorophyll content were recorded when
applied 15 m³ fed-¹ FYM , inoculation by B.megatherium in combination with SP and
sprayed Fe-EDTA. Moreover, dry weight of both shoots and roots, at flowering stage, increased
due to 15m³ fed-¹ FYM combined with hi~h rate of SP application as well as RP was
superior when combined with 10m³ fed - FYM and inoculation with B.megatherium. In addition, data indicated that FYM applied at a rate 15m³ fed-¹ increased N,P
& K uptake by both shoots and roots, at flowering stage, of wheat plant as compared
to low rate 10m³ fed-¹ FYM. Similar trend was obtained when soil inoculated with
B.megatherium as compared to no inoculation. Results also revealed that low rate of
rock phosphate (RPA) was more effective for N,P&K uptake as compared to the other
RB rate (RBP) , opposite trend was recorded for high rate of super phosphate (SPP),
which, increased N,P&K uptake by both shoots and roots. Generally, foliar application
of FeS04 was superior for both N,P&K uptake by shoots and roots. At harvest stage, wheat took the same direction for N,P&K uptake by yield
components( straw and grains), in spite of Fe-EDTA was superior as compared to
FeS04. On the other hand, mean values of wheat yield components increased
significantly due to the application of high rate of FYM ; these increases were
14.0%,11.4% and 3.47% for straw, grains and weight of 1000 grains, respectively.
High rates of both RP and SP were more affective as compared to lower rate under
spraying with Fe-EDT A. The interaction between tested treatments showed that the
highest grain yield of wheat was accompanied with 15 m³ fed-¹ FYM application,
inoculation with B.megatherium combined with SPB and foliar application with Fe-
EDTA.