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Ricinus communis is a highly weed-sensitive crop, and this competition generates reduced economic yields. The use of herbicides may be a viable alternative. However, herbicides may become phytotoxic to germination processes and plant growth. In this study, we aimed to evaluate the selectivity and efficiency of herbicides that inhibit cell division and photosynthesis, respectively, in castor culture. We used a completely randomized block experimental design with four replications. Treatments consisted of control (manual weeding), 2.4 and 4.0 L ha of Diuron herbicide, and 5.0 and 7.0 L ha of Alachlor herbicide. We concluded that Diuron can be recommended to castor bean culture; however, Alachlor is not recommended because it affects the germination process and reduces the emergence speed of castor bean seedlings. Alterações na qualidade fisiológica de sementes de mamoneira provocadas por herbicidas Changes in physiological qualities of castor bean seeds caused by herbicides Adaílton Conceição dos Santos1 Cácio Luiz Boechat2* José Carlos de Cerqueira Moraes3 Maria de Fátima da Silva Pinto Peixoto1 Lucas De Oliveira Ribeiro1 1Universidade Federal do Recôncavo da Bahia – UFRB, Centro de Ciências Agrárias, Ambientais e Biológicas, Campus Universitário, 44380-000, Cruz das Almas, BA, Brasil 2Universidade Federal do Rio Grande do Sul – UFRGS, Faculdade de Agronomia, Av. Bento Gonçalves, 7712, Agronomia, 91540-000, Porto Alegre, RS, Brasil 3Colégio Estadual Alberto Torres, Secretaria Estadual de Educação, Rua Rui Barbosa, Centro, 44380-000, Cruz das Almas, BA, Brasil Autor Correspondente: *E-mail: clboechat@hotmail.com PALAVRAS-CHAVE Planta daninha Fitotoxicidade Germinação Ricinus communis L.

Alterações nas qualidades fisiológicas de sementes de mamoneira provocadas por herbicidas