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Excessive use of agrochemical was one mechanism of increase crop production and which leads
\nto environmental damage. Microorganisms are important for agriculture in order to promote the
\ncirculation of plant nutrients and reduce the need for chemical fertilizers. Today researchers are
\nable to repeatedly use them successfully in field experiments to increase growth and yields of
\nsome crop and vegetables in different nations; however data on the effect of cyanobacteria on the
\ngrowth of rice, tomato and pepper seedlings is inadequate. The aim of this study was to isolate
\nand evaluate the effect of cyanobacteria on the growth of rice, tomato and pepper seedlings with
\ndeferent cultivars. The study designs were randomized, purposeful laboratory based experiment.
\nSediments sample used to isolate Bacillus and soil sample used to isolates Cyanobacteria were
\ncollected randomly from Lake Tana and from Gondar Teacher Education Collage respectively.
\nThe seeds of Peppers and Tomato were collected from Adet Agriculture Research Center and
\nRice seeds from Woreta Rice Research Center. The seedling of pepper, rice and tomato were
\nprepared in University of Gondar, Biology department field experiment station. Pot experiments
\nin laboratory were conducted to evaluate the effect of Cyanobacteria and Bacillus on Rice,
\nPepper and Tomatoes seedling. Five Bacillus and two Cyanobacteria species were isolated and
\nidentified from Lake Tana and from Lake Tana and from Gondar Teacher Education Collage
\nrespectively. All five Bacillus and tow Cyanobacterial isolates showed positive effects on the
\ngrowth of pepper, rice and tomato seedlings as compared to the control, however their
\neffectiveness varies from isolate to isolate and also from cultivar to cultivar. Among all
\nCyanobacteria isolate (C1) was considered as having more plant growth promoting ability in all
\ncultivars of tomato Melkesalsa (70%, 70.4%), kochero (75%, 76%) and Miya (92.5%, 79%)
\nshoot length and root length respectively relative to other. In pepper plant cv. Endiam42 from all
\nisolates C1 provide more growth promotion with efficacy (80.73%,66. 72%) shoot length and
\nroot length respectively and in cv. Markofana B4 was showed higher efficacacy(81.5%, 73.86%)
\nshoot length and root length respectively relative to other. In Rice cv. X-jigna and cv. Edget C2
\nshowed higher growth promotion efficacy (37.93%, 50.53%) and (50.07%, 52.9%) respectively.
\nThus, microorganisms could be considered as one of the possible biofertilizer that leads to
\nincrease the health and vigor of seedlings.

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