QUALIFICATION OF FERTILIZATION WITH SOME NATURAL SOURCES OF POTASSIUM AND BACTERICAL INOCULATION WITH Bacillus circulans FOR YIELD OF BROADBEAN AND THEIR ECONOMICAL UTILITY IN A SANDY SOIL

A pot experiment was carrying out in winter season by using a
sandy soil from Ismallia Governorate, at Agriculture research center
(ARC) during the winter season of 2007.
Treatments of the experiment were: Potassium sulfate, K2SO4
(M), nature potassium compost rich in K-content (C) and potassium
feldspar (K-bearing mineral, KAlSi3O8) (F) were used in a solo or in
a mixture forms at rates of 50%, 75% and 100% of the recommended
dose (R.D) of potassium (24 Kg K2O / fed.). As well as inoculation
seeds of broad bean (Vicia faba.L , cv. Giza 843 variety) with or
without K-dissolved bacteria Bacillus circulans (KDB).
Seeds and straw yields, the percent of K that take by seeds from
added potassium fertilizers (ADK %) as well as the differences
between costs of production and profits of incomes (i.e., Net Gain)
were mathematically calculated as LE/fed., to test the qualification of
this work and to define the most profitable recommended treatments
in this research.
In general, inoculation with Bacillus circulans gave higher yields
of seeds and straw of broad bean plants than under non-inoculation
condition.
Used of any type of K- fertilizer significantly increased yields of
seeds and straw of broad bean plants comparing with non-fertilized
treatment (control). On the other hand, increasing the rate of
QUALIFICATION OF FERILIZATION WITH SOME NATURAL726
application from 50% to 100% R.D, in general, significantly increased
the yield of seeds and straw of broad bean plants comparing with the
rate of 0% K.R.D (control). The results of 75% R.D under inoculation
were nearest from the results of 100% R.D.
As for the effect of different types of K- fertilizers on yields of
straw and seeds, data defined that:
Mineral fertilizer type K2SO4 (M) was the best treatment
followed with (F) treatment, when they added in a solo form, on the
previous parameters.
With respect to the dual mixture of K-fertilizers (M+F) followed
with (M+C) gave the best effects on straw yield while, (F+C) gave
pronounce effect on seed yield.
The triple mixture of (M+C+ F) shows a significant response on
the yield of seeds.
Concerning to ADK % of seeds:
Inoculation with KDB and increasing the rate of K- application
significantly increased ADK % of seeds.
The treatment of (M), (F) and (M+F) were the best treatments in
increasing ADK % of seeds.
Finally, the best treatments which achieved the highest net gain
(LE/fed.)-under the circumstance work- were obtained under
inoculation with KDB treated with 75% or 100% R.D of (M), (F) or
mixture between them