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Four Azospirillum strains were used in this study. These strains were treated with three concentrations of sodium azide as follows; 25, 26, 27 μg / ml. Five isolates were isolated from each concentra...
A specially constructed measuring ap- paratus, made in the Department of Agricultural Production Technology in Rzeszów, was used to measure the force necessary for extracting sugar beet roots from th...

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