Physiological potential of seeds from silage sorghum due to different sequence of conditioning

O presente trabalho teve por objetivo verificar o efeito de tr??s seq????ncias de beneficiamento sobre a qualidade de lotes de sementes de sorgo silageiro (Sorghum bicolor L.) e, para tal, utilizaram-se os cultivares FEPAGRO-RS 11, FEPAGRO-RS 12, FEPAGRO 17 e FEPAGRO 18. Os tratamentos consistiram das seguintes seq????ncias: T1 apenas a pr??-limpeza; T2 pr??-limpeza mais tr??s passagens pela limpeza; T3 pr??-limpeza, polimento e limpeza. A opera????o de pr??-limpeza foi realizada com m??quina de ar e peneiras, contendo uma peneira com orif??cio de 5,0mm de di??metro. A limpeza foi efetuada na mesma m??quina de ar e peneiras, cujas peneiras tinham orif??cios redondos de 3,2 e 2,8mm. O polimento foi realizado com um polidor de cereais da marca Grimm (6 a 10sc/h). Os tratamentos foram avaliados atrav??s das determina????es do grau de umidade, massa de mil sementes e an??lise de pureza e dos testes de germina????o, primeira contagem da germina????o, envelhecimento acelerado, condutividade el??trica e tetraz??lio, aplicados logo ap??s o beneficiamento e 12 meses depois. Observaram-se diferen??as entre os cultivares, quanto ao grau de umidade inicial, massa de mil sementes e qualidade fisiol??gica das sementes. Todos os tratamentos de beneficiamento permitiram obter pureza f??sica superior a 99,0%. Concluiu-se que a seq????ncia de beneficiamento composta pelas opera????es de pr??-limpeza, polimento e limpeza melhora o aspecto visual e n??o prejudica o potencial fisiol??gico das sementes de sorgo silageiro.This paper had the objective of checking the effects of three different sequence of conditioning on the qualities of seeds from silage sorghum (Sorghum bicolor L.) and to such deed, it was used FEPAGRO-RS 11, FEPAGRO-RS 12, FEPAGRO 17 e FEPAGRO 18. The treatment followed the next sequence: T1- pre cleaning; T2 pre cleaning plus three passages through cleaning; T3 pre cleaning, polishing and cleaning. The pre cleaning procedure was done by a pre-cleaning machine with a 5,0mm diameter sieve. The clean was done with an air machine and sieves, whose round holes measured 3,2 and 2,8mms. The polishing was performed by a cereal polisher machine from the brand Grimm (6 to 10sc/h). The treatments were measured through the levels of moisture, the mass of thousand seeds, purity physical analysis and germination tests, first germination count, accelerated aging, electric conductivity and tetrazolien, applied right after the conditioning and 12 months later. It as observed some differences between FEPAGRO-RS 11, FEPAGRO-RS 12, FEPAGRO 17 e FEPAGRO 18, concerning the levels of initial moisture, the mass of thousand seeds and the physiological qualities of the seeds. All the conducting treatments managed to obtain a purity quality superior to 99,0% It can be concluded that the sequence of conditioning consisted by the pre cleaning operations, polishing and cleaning, improves the visual aspect and does not damage the physiological potential of the seeds from silage sorghum