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An experimental design of random blocks was used, with 7 treatments and 3 replicates. The control was fertilized with NH4NO3 (150 kgNa/ha), absolute control and 5 inoculated treatments. Differences between means were determined with LSD test of Fisher. The evaluated variables were aerial dry weight, increase of aerial dry weight regarding absolute control, stem length, grain yield, increase of grain yield with respect to absolute control and weight of 1000 seeds. It should be noted that the aerial dry weight increase regarding absolute control in Ho9 was 21 %. The increase
of the grain yield with respect to the absolute control was 10 and 20 % in Ho13 and Ho5, respectively. It is concluded that Ho5 and Ho13 isolates had a positive effect on grain yield, and to a lesser extent, Ho1 and Ho9, in cob length and increase of aerial dry weight, respectively. Future field experiments, under conditions of drought with the Ho5 and Ho13 isolates, are recommended in different soil types of Sancti Spíritus province.
Key words: Bradyrhizobium sp., agricultural drought, grain yield
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