%0 Journal Article
%T Sele  o de inoculantes ¨¤ base de turfa contendo bact¨¦rias diazotr¨®ficas em duas variedades de arroz = Selection of peats inoculants with diazotrophic bacteria in two rice varieties
%A Joilson Silva Ferreira
%A Jos¨¦ Ivo Baldani
%A Vera L¨²cia Divan Baldani
%J Acta Scientiarum : Agronomy
%D 2010
%I 
%X O estudo consistiu em avaliar a sobreviv¨ºncia e a efici¨ºncia das bact¨¦rias diazotr¨®ficas Herbaspirillum seropedicae, Burkholderia sp. e Azospirillum brasilense, inoculadas em dois tipos de turfas. A sobreviv¨ºncia das bact¨¦rias foi determinada pelo m¨¦todo do N¨²meroMais Prov¨¢vel (NMP), durante o armazenamento de at¨¦ seis meses. A efici¨ºncia foi avaliada pela contribui  o destas bact¨¦rias nos parametros agron micos de ac¨²mulo de massa seca e N-total dos gr os nas variedades de arroz IR42 e IAC4440. O experimento foi conduzido emvasos com solo, em delineamento inteiramente casualizado com tr¨ºs repeti  es, em arranjo fatorial 2 x 4. Os dados obtidos mostraram que o inoculante contendo a estirpe de Burkholderia sp. manteve o n¨²mero de c¨¦lulas vi¨¢veis em torno de 108 cel. g-1 de turfa no per¨ªodo testado, enquanto nos demais inoculantes este n¨²mero ficou em torno de 106. Os ensaios de inocula  o n o mostraram diferen as significativas quanto ¨¤ origem das turfas usadas como ve¨ªculo sobre os parametros agron micos e sobreviv¨ºncia das bact¨¦rias. O tratamento que continha H. seropedicae manteve o ac¨²mulo de massa seca e N-total dos gr os estatisticamente igual ao tratamento que recebeu 40 kg N ha-1, embora tenham sido observados aumentos de 13 e 19,4% nestes parametros na variedade IAC4440. Os resultados mostraram-se promissores quanto ¨¤ utiliza  o da pr¨¢tica de inocula  o na cultura do arroz. The study consisted of a comparison of two-peat materials (Brazil and Canada) containing different C-total content. The peats were inoculated with strains of Herbaspirillum seropedicae ZAE 94, Burkholderia sp. M130, and Azospirillum brasilense Sp109, and monitored during a period of six months in relation to variation on humidity and survival of bacteria in the inoculant. The quantification of viable cells in the inoculant was measured by the Most Probable Number (MPN) method. The rice seeds were pelleted with the respective inoculants, grown in pots containing soil and maintained outside a greenhouse. The dry mass accumulation, Npercent, N-total and yield were determined during the plant cycle. The humidity content varied with storage period. The survival measurement showed that only Burkholderia sp. M130 maintained the number of viable cells around 108 g-1 of peat, while there was a reduction in population of other strains. An increase of yield and total N of 13 and 19.4%, respectively in comparison to treatment fertilized with 40 kg N ha-1 was observed for variety IAC4440,inoculated with strain ZAE94. There was no difference in yield of the IR42 inoculated with either ZAE9
%K fixa  o biol¨®gica nitrog¨ºnio
%K ve¨ªculos de inocula  o
%K nitrogen biological fixation
%K inoculant carriers
%K Herbaspirillum seropedicae
%U http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/732/732