Resumo

BAEZ-PEREZ, Ana Laura et al. Inoculacion and use of urea fertilizer on plant of Fraxinus uhdei with mycorrhizal fungi in acrisols from degraded sites. Bot. sci [online]. 2015, vol.93, n.3, pp.501-508. ISSN 2007-4476.  https://doi.org/10.17129/botsci.207.

In severely degraded soils, plant establishment is difficult because of lack of structure, a depleted community of microorganisms and in many sites low concentrations of macronutrients. Under these conditions, the use of interactions with mycorrhizal fungi could be an effective strategy for revegetation and ecological restoration. An experiment was established in mesocosms with soil gathered from a severely degraded site (acrisols with gully formations). The objective of the study was the evaluation of the performance of Fraxinus uhdei (Wenz.) Lingelsh (ash) inoculated with the mycorrhizal fungi Pisolithus tinctorius and Rhizophagus intraradices, each species by itself or in combination and also with presence or absence of nitrogen fertilization. Height, canopy cover, diameter at the base of the stem and number of leaves were evaluated at the end of the experiment, afterwards biomass was harvested. Samples were prepared to verify mycorrhization. Results showed that fertilization had no significant effect on plant development but had a negative effect on survival (with urea 67 %, without urea 90 %). The highest values for growth variables and biomass were those of plants with dual inoculation, and the lowest for control plants or plants inoculated with P. tinctorius (height 23.3 cm against 15.8 cm, DAB 0.74 cm against 0.5, dry aboveground weight 2.0 g against 1.0 g). These results suggest that in severely degraded soils dual inoculation of plant species tolerant to degraded sites can be an efficient revegetation strategy.

Palavras-chave : co-inoculation; ecological restoration; Pisolithus tinctorius; Rhizophagus intraradices; symbiosis.

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