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 [electronic resource].

Includes reference.

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, K2S04 (M), nature potassium compost rich in K-content (C) and potassium feldspar (K-bearing mineral, KAlSi308) (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 K20 / 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 po~sium 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 application from 50% to 100% RD, 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 of75% RD under inoculation were nearest from the results of 100% RD. As for the effect of different types of K- fertilizers on yields of straw and seeds, data defined that: Mineral fertilizer type K2804 (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 ofK-fertilizers (M+F) followed with (M+C) gave the best effects on stmw 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% RD of (M), (F) or mixture between them.

Summary in Arabic.

1