| Summary: | <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--><p class="MsoNormal" style="text-align: justify;">O juazeiro (<em style="mso-bidi-font-style: normal;">Ziziphus joazeiro</em> Mart.) é uma das espécies endêmicas da caatinga de grande importância econômica e ecológica. O objetivo deste trabalho foi avaliar o potencial alelopático do extrato de folhas de juazeiro (<em style="mso-bidi-font-style: normal;">Ziziphus joazeiro </em>Mart<em style="mso-bidi-font-style: normal;">.</em>) em sementes de alface (<em style="mso-bidi-font-style: normal;">Lactuca sativa </em>L<em style="mso-bidi-font-style: normal;">.</em>). O experimento foi conduzido em delineamento inteiramente casualizado com 4 repetições e cinco tratamentos (0%, 25%, 50%, 75% e 100% de concentração do extrato bruto). O extrato bruto foi obtido por infusão (água fervida a 100°C sobre as folhas de <em style="mso-bidi-font-style: normal;">Z. joazeiro). </em>As características avaliadas foram percentagem de germinação, percentagem de plântulas normais e anormais, comprimento da parte aérea e radicular das plântulas de alface. Os resultados mostraram efeito alelopático do extrato dependendo da concentração. 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