Abstract

BANUELOS, Jacob et al. Effect of different phosphorus levels on avocado inoculated with arbuscular mycorrhizal fungi. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.7, pp.1509-1520. ISSN 2007-0934.

The arbuscular mycorrhizal fungi (HMA) are a biological alternative to increase the absorption of phosphorus and reduce the excessive use of phosphate fertilizers. The objective of this work was to evaluate the effect of different concentrations of phosphorus fertilization on avocado plants with and without mycorrhiza. A factorial design was used with two factors: mycorrhizal inoculant (with three levels: Rizofermic-UV, Pacispora scintillans and uninoculated) and fertilization with phosphorus (with five levels: without fertilizer, 20, 40, 80 and 160 ppm; using H2PO4 as fertilizer source), each treatment with four replicates. 401 days after inoculation, height, diameter, number of leaves, leaf area, growth rate, fresh and dry weight and percentage of mycorrhizal colonization were evaluated. Variables were analyzed using a Fisher’s test, with a significance level of p< 0.05. being considered significant. The treatment with 160 ppm caused the death of the plants at 150 days, while inoculated seedlings plus 20 ppm showed an increase in significant growth variables (p< 0.05) with respect to the control. Both plants inoculated with Rizofermic-UV and P. scintillans showed a significant increase in growth variables with respect to the control (p< 0.05). The plants inoculated with P. scintillans and also with a treatment of 20 ppm of phosphorus, promote the greatest increase in growth variables. Mycorrhization had positive and significant effects on the development of the inoculated plants compared to the control plants.

Keywords : inoculant; fertilization; phosphorus; mycorrhiza.

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