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EnglishIn order to have more accurate information of seed quality among different seed lots, it is necessary to supplement the data supplied by the germination test with other tests, making possible the selection of best lots for marketing and seeding establishment and among those tests the electrical conductivity test fits well to that purpose. For physic nut (Jatropha curcas L.), no information about electrical conductivity test methods is available in the literature. Thus, the aim of this research was to establish a standard method for testing the electrical conductivity of physic nut seeds leaking, testing different number of seeds, amount of water and soaking period. So, we used eight lots of physic nut seeds proceeding the electrical conductivity test with the following variations: 15, 25 or 35 seeds, soaked in 75 or 100 mL of distilled water at 25 oC, and the readings performed after 3, 6, 9, 12, and 24 hours of soaking. As a matter of fact, were determined the germination percentage and the seedling emergence rate. Based on the results and on the correlation coefficients calculated between the results of electrical conductivity test and emergence percentage, the most efficient methods were with 15 seeds under soaking in 75 mL of water, with readings after 6, 9 and 12 hours; 25 seeds under soaking in 75 mL of water, with readings at the same time mentioned before, but the most appropriate method to to distinguish physic nut seed lots with different physiological quality is the use of 15 seeds in 75 mL of water, with reading after six hours of its starting. portuguesPara uma analise mais completa da qualidade de sementes, faz-se necessario complementar as informacoes fornecidas pelo teste de germinacao com testes de vigor, possibilitando, assim, selecionar os melhores lotes para comercializacao e semeadura. Dentre esses testes, destaca-se o de condutividade eletrica. Para sementes de pinhao-manso (Jatropha curcas L.), nao ha informacoes referentes a metodologia do teste de condutividade eletrica na literatura. Objetivou-se neste trabalho estabelecer metodologia para o teste de condutividade eletrica em sementes de pinhao-manso, variando-se o numero de sementes, a quantidade de agua e o periodo de embebicao. Para tanto, foram utilizados oito lotes de sementes de pinhao-manso, e o teste de condutividade eletrica foi realizado com as seguintes variacoes: 15, 25 ou 35 sementes, embebidas em 75 ou 100 mL de agua destilada a 25 oC, sendo as leituras realizadas apos 3, 6, 9, 12, e 24 horas de embebicao. Para efeito de comparacao, foram determinadas a porcentagem de germinacao e a porcentagem e indice de velocidade de emergencia. Com base nos resultados obtidos e pelos coeficientes de correlacao calculados entre os resultados de condutividade eletrica e porcentagem de emergencia, verificou-se que as metodologias mais eficientes foram com 15 sementes e 75 mL de agua, com leituras apos 6 horas, 9 horas e 12 horas e 25 sementes e 75 mL de agua, com leituras, tambem, apos 6 horas, 9 horas e 12 horas. Concluiu-se que o teste de condutividade eletrica foi eficiente para diferenciar lotes de pinhao-manso quanto a qualidade fisiologica das sementes. A metodologia mais adequada para a realizacao do teste de condutividade eletrica para sementes de pinhao-manso e a conduzida com o uso de 15 sementes e 75 mL de agua, com leitura apos 6 horas de embebicao.

Teste de condutividade elétrica para sementes de pinhão-manso (Jatropha curcas L.)