| Summary: | <p>Caatinga stylo (<em>Stylosanthes seabrana</em>) is recommended as a forage legume for permanent and long-term ley pastures on clay soils of southern (cv. Primar CPI92838B) and central (cv. Unica CPI110361) Queensland. The release of the 2 cultivars was contingent on the availability of an effective and persistent strain of <em>Bradyrhizobium,</em> because suitable effective nitrogen-fixing strains do not occur naturally in the soils of the target regions. Effective strains of <em>Bradyrhizobium</em> (strains CB3480 and CB3481), suitable as inocula for Caatinga stylo, were selected from nodule material collected in Bahia, Brazil.</p> <p>This paper documents soil-pot and field experiments that led to the selection of these persistent and effective strains of <em>Bradyrhizobium </em>and the eventual release of CPI92838B and CPI110361, respectively, as cvv. Primar and Unica.</p> <p><strong> </strong></p><p><strong>Keywords:</strong> Inoculation, nitrogen fixation, nodulation, soil temperature, survival.</p><p><strong>DOI: </strong><a title="10.17138/TGFT(4)54-70" href="http://dx.doi.org/10.17138/TGFT(4)54-70" target="_blank">10.17138/TGFT(4)54-70</a></p>
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