Abstract
The aim was to evaluate the initial development of maize plants when submitted to mineral fertilization with magnesium sources in the presence or absence of seed inoculation with Azospirillum brasilense. To do so, was conducted an experiment in greenhouse. In the essay was adopted a randomized blocks design, in a factorial scheme 3 × 2, represented by the magnesium sources: magnesium sulfate (MgSO4), magnesium oxide (MgO) and control without Mg fertilization, in the presence or absence of inoculation with A. brasilense. The Mg sources were supplied with a dose of 30 kg ha-1, being homogenized in the substrate before sowing the crop. The analysis were carried out in the V4 stage, evaluating: basal stem diameter (BSD); relative chlorophyll content (SPAD index), leaf dry mass (LDM), stem + sheath blade dry mass (SSDM) and root dry mass (RDM). No differences were observed for the factors interaction and for the Mg sources. When considered the seed inoculation there was increases of 7.1%; 6.61%; 19.23%; 28.32%; and 15.17 %, for basal stem diameter, SPAD index, leaf dry mass, stem + sheath blade dry mass and roots, respectively. The inoculation of maize seeds with A. brasilense increases the initial development of maize plants and the SPAD index in greenhouse conditions in the V4, while the fertilization with the magnesium sources do not interfere in the maize development.
Highlights
The maize crop (Zea mays L.) has a great relevance in the world agricultural production, being the main cereal produced
Among the production techniques that ensure the expression of the yield potential is highlighted the mineral fertilization of plants with macro and micro nutrients, which provide an adequate of the crop
Weighing was made in an analytical balance chapel chamber type, determining the leaves dry mass (LDM), stem plus sheath blade dry mass (SSDM) and root dry mass (RDM), all results expressed in grams (g)
Summary
The maize crop (Zea mays L.) has a great relevance in the world agricultural production, being the main cereal produced. Among the production techniques that ensure the expression of the yield potential is highlighted the mineral fertilization of plants with macro and micro nutrients, which provide an adequate of the crop. Other ways started to be studied aiming maximize the maize yield potential, among them is the maize seed inoculation with plant growth promoting bacteria (PGPB), because they stimulate the plant development from the supply of vegetal hormones such as auxins, gibberellins and cytokinin (Kuss et al, 2007), providing, in many cases, more vigorous and productive plants (Cassan & Diaz-Zorita, 2016). Among the positive effects of A. brasilense in the plant development stand out the higher nutrient absorption (Hungria et al, 2010), having a potential synergy effect when associated to the mineral fertilization of plants. The aim was to evaluate the initial development of maize plants when submitted to mineral fertilization with magnesium sources in the presence or absence of seed inoculation with Azospirillum brasilense
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