ISSN: 1659-2751

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Evaluation of the Use of Arbuscular Mycorrhizal Fungi to Reduce the Application of Phosphorus Fertilizers in Corn

Abstract

The arbuscular mycorrhizal fungi (AMF) are soil organisms that live symbiotically with most plants, enabling them to improve their growth and nutrition through hyphae which acts as an extension of the root. The objective of this study was to evaluate the effect of Glomus fasciculatum on the growth of hybrid corn Hs5g and determine whether it is feasible to reduce the application rate of P, as a strategy to contribute to the development of a more sustainable maize production system. The experiment was established in a completely randomized design in a 2 x 4 factorial. The first factor consisted of two levels: a) inoculation of AMF G. fasciculatum and b) without inoculation of the fungus (control). The second factor was the fertilization of P at four levels: 0 kg ha-1, 19.8 kg ha-1, 39.6 kg ha-1 y 60 kg ha-1 of P. The colonization of AMF in maize was successful and the uninoculated treatment showed no infection. The treatments with G. fasciculatum producing the largest percentage of mycelia, arbuscules, vesicles and colonization were G. fasciculatum + 0 kg ha-1 P and G. fasciculatum + 19.8 kg ha-1 P, the latter presenting the greatest plant height and total and aboveground biomass. With increasing doses of P there was a decreased the effect of G. fasciculatum in biomass production of corn. Inoculation with G. fasciculatum reduced the use of phosphate fertilizer up to 33 % (19.8 kg ha-1 P) of the recommended dose of P for the area.

Key words: phosphorus fertilization, Glomus fasciculatum, corn, mycorrhiza.

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