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Revista Chapingo. Serie horticultura

On-line version ISSN 2007-4034Print version ISSN 1027-152X


QUINONES-AGUILAR, Evangelina Esmeralda; LOPEZ-PEREZ, Luis  and  RINCON-ENRIQUEZ, Gabriel. Growth dynamics of papaya due to mycorrhizal inoculation and phosphorous fertilization. Rev. Chapingo Ser.Hortic [online]. 2014, vol.20, n.2, pp.223-237. ISSN 2007-4034.

Papaya is a major fruit export for Mexico; however, the international market is increasingly demanding bio quality, representing a significant production challenge due to the need for bio-ecological and sustainable technologies. Arbuscular mycorrhizal fungi (AMF) can contribute significantly to plant nutrition, particularly in phosphorous (P) uptake. The use of AMF in papaya is yielding encouraging results, but there is a need to define certain aspects regarding agronomic management of AMF-based products. The aim of this study was to evaluate the effect of AMF Glomus sp. Zac-2 and P fertilization on the growth of Cera var. papaya during the nursery stage. For this, a 2 x 3 x 4 tri-factorial experiment (AMF inoculation, P source and P dose) was conducted in a completely randomized design. The variables plant height (PH) and stem diameter (SD) were evaluated every 15 days; dry biomass (DB) and spore density (SD) were assessed at the end of the experiment (90 days). From the DB of plants with and without mycorrhizal inoculation, the relative mycorrhizal dependency index (RMDI) was calculated. Data analysis showed significant differences (P ≤ 0.05) between papaya plants with and without AMF for PH, SD and DB, regardless of the P dose and source. At 75 days, growth increases of more than 500 % were recorded in plants with AMF compared to the non-inoculated plants; the RMDI was 99 %. These results suggest that AMF inoculation in papaya during the nursery phase can benefit further growth in the field.

Keywords : Carica papaya L.; superphosphate; phosphate rock; mycorrhizae; mycorrhizal symbiosis; phosphorus uptake.

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