Micorrização e desenvolvimento inicial de plantas de milho com aplicação de inoculantes bacteriano e fúngico sob doses de fósforo

Abstract

The term mycorrhiza or mycorrhization, applied to plants of agronomic interest such as corn, began to attract the attention of producers and researchers due to the discovery of the ability of the association between plants and fungi to absorb nutrients with low mobility in the soil, such as phosphorus. Therefore, the objective of the work was to evaluate mycorrhization in corn plants with the application of bacterial and fungal inoculants at different doses of phosphorus in a typical Dystrophic Red-Yellow Oxisol with medium texture. The experiment was carried out in a greenhouse at the State University of Goiás, Campus Sul – Ipameri Unit, following a completely randomized experimental design, with seven treatments and four replications, as described below: one – recommended phosphorus (P) fertilization; two – recommended fertilization of phosphorus + mycorrhizae (P-M); three – recommended fertilization of phosphorus + BiomaPhos (P-B); four – recommended fertilization of phosphorus + mycorrhizae + BiomaPhos (P-M-B); five – half of the recommended phosphorus + mycorrhizae fertilizer (½P-M); six – half of the recommended phosphorus + BiomaPhos fertilizer (½P-B); seven – half of the recommended fertilization of phosphorus + mycorrhizae + BiomaPhos (½P-M-B). At 45 Days After Emergence, the parameters for: mycorrhizal colonization (CM), aerial part dry mass (MSPA) and root system dry mass (MSSR) were evaluated. In general, the application of P at the recommended dose of 500 kg ha-1 and 250 kg ha-1 of the phosphor dose with the inoculation of microorganisms provided better results up to 42 days, which did not reflect in plant height and stem diameter. Up to 42 days after emergence, higher rates of mycorrhizal colonization were observed in plants where half of the phosphor dose was applied together with the inoculation of microorganisms.