In a research, Brown et al., in (1968) connect the benefits of Azotobacter Chroococcum over the tomato plant growth to the plant hormones like IAA and Gibberellins. Many years later some researchers reported the same results from their researches.
Gibberellin is a well-known endogenous factor to be strongly and negatively correlated with flowering levels in citrus (GOREN and GOLDSCHMIDT, 1970; GRAVINA, 2007; IGLESIAS et al., 2007; KOSHITA et al., 1999).