Abstract
ABSTRACT Seed treatment with inoculants based on plant growth-promoting bacteria (PGPB) or the application of humic acids (HA) may increase the productivity of plants of agricultural interest. The hypothesis of this work is that it is possible to combine the effect of plant growth promoting characteristic of HA with the inoculation of PGPB selected strains in the treatment of maize seeds. Thus, providing superior responses than in single applications of both in the initial maize development. To meet this purpose, we conducted isolated application of HA or PGPB inoculation of Burkholderia gladioli and Rhizobium cellulosilyticum, and the combined application of PGPB and HA for treatment of maize seeds. At the end of the experiment (45 days after germination), the plants were evaluated biometrically, nutritionally and a bacteria count was performed in plants using the Most Probable Number technique. The results showed that it is possible to combine the effects of HA with the inoculation of selected strains of PGPB, obtaining superior responses to the isolated application of both. Thus, the use of HA-based bio-stimulants in combination with PGPB is positive and complementary compared to inputs generally used in the treatment of maize seeds.
Highlights
In the search for higher current levels of productivity and reduction in maize production costs, new technologies have been incorporated into the production systems, among them, the use of biostimulants and inoculants based on plant growth-promoting bacteria (PGPB)
The results showed that it is possible to combine the effect of plant growth promoting characteristic of humic acids (HA) with the inoculation of selected strains of endophytic diazotrophic bacteria to obtain superior responses to the isolated application of both (Table 1 and 2)
The PGPB infection process occurs from its penetration into plant tissue through small openings created by new lateral roots emergence, and by roots and/or in the rhizosphere ion transport process (Canellas et al, 2012)
Summary
In the search for higher current levels of productivity and reduction in maize production costs, new technologies have been incorporated into the production systems, among them, the use of biostimulants and inoculants based on plant growth-promoting bacteria (PGPB). These agronomic strategies are considered promising for productivity increase and have gained space and importance in recent years (Alves et al, 2014). The results of plant growth promotion with PGPB inoculation of the genera Herbaspirillum and Azospirillium, are well documented, being the latter with registration in the Ministry of Livestock Farming and Supply for use in commercial formulations (Hungria et al, 2010). There has been great interest in studies of other genera for formulations of inoculants among these Rhizobium and Burkholderia (Qureshi et al, 2013; Perin et al, 2006)
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