EFFECTIVNESS OF SALT-TOLERANT RHIZOBIUM (E1 & F1) INOCULATION AND MINERAL NITROGEN FERTILIZATION ON FABA BEAN PLANTS AND WITHSTAND TEST OF ISOLATE F1 TO PESTICIDAL TOXICITY

El-Khateeb, Nagwa M. M.; Belal, E. B. A.; Shalaby, M. E.; El-Gremi, SH. M. A.

doi:10.21608/jacb.2012.55015

EFFECTIVNESS OF SALT-TOLERANT RHIZOBIUM (E1 & F1) INOCULATION AND MINERAL NITROGEN FERTILIZATION ON FABA BEAN PLANTS AND WITHSTAND TEST OF ISOLATE F1 TO PESTICIDAL TOXICITY

Document Type : Original Article

Authors

Dept. of Agric. Botany, Agric. Microbiology, Fac. Agric., Kafrelsheikh Univ., Egypt

10.21608/jacb.2012.55015

Abstract

Applicability of salt-tolerant bacterial isolates (F1 and E1) of Rhizobium leguminosarum biovar viciae was compared with the mineral Nitrogen fertilization on faba bean plants, under saline field conditions. Higher magnitudes of shoot length, dry weight of shoots and roots than control and N-fertilized plants were achieved. Results were more pronounced due to use dual combinations of F1 or E1 with 25 % N-supply. Parameters of N2-fixation, seed yield and its crude proteins of both faba bean cultivars (Nubaria 1 and Sakha 1) were also, enhanced due to superiority of the dual treatments. So, utilization of salt-tolerant rhizobial isolates could be attributed to overcome the harmfull effect of soil salinity on growth, nodulation and seed productivity of faba bean plants. On the other hand, the largest diameter of inhibition zone reached 4.20 cm which representing 46.67 % growth inhibition of Rhizobium which was achieved via 1 g L-1 of Vitavax under laboratory conditions. Slope fitting data of the experimental values showed constant inhibitory effect of Ground-up, Malathion and Vydate with increasing their concentrations against Rhizobia. For Vitavax, sharp ascending slope was resulted; indicating induction of further inhibition with additional dose would be expected.

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