Abstract

GONZALEZ-OSORIO, Hernán; GONGORA BOTERO, Carmenza Esther; JARAMILLO PADILLA, Sandra Patricia  and  OSORIO, Wálter. Plant growth and phosphorus uptake of coffee seedlings through mycorrhizal inoculation. Agron. colomb. [online]. 2022, vol.40, n.1, pp.77-84.  Epub Sep 26, 2022. ISSN 0120-9965.  https://doi.org/10.15446/agron.colomb.v40n1.98599.

Soil phosphorus (P) availability is a limiting factor for coffee seedling growth. Usually, large amounts of P fertilizers are required, generating nutritional imbalance, increasing production costs, and raising environmental concerns in water pollution. The use of arbuscular mycorrhizal fungi (AMF) can enhance plant P uptake and growth and reduce the dose of P fertilizers. A greenhouse experiment was conducted in a substrate containing Paleudult soil and quartz sand, with low level of soluble P (1 mg kg-1), to establish the effect of AMF inoculation with Rhizoglomus fasciculatum on coffee (Coffea arabica L. cv. Colombia) seedlings growth and P uptake under three levels of P in soil solution (0.002, 0.02, and 0.2 mg L-1). AMF colonization was significantly reduced when contents of P in solution increased. Shoot dry weight and P foliar concentration were increased by the AMF inoculation when soil P in solution was 0.02 mg L-1; these effects were lower at 0.2 mg L-1 and null at 0.002 mg L-1 P. Results showed that AMF inoculation can play an important role in the growth of coffee seedlings as long as the content P in soil solution maintains intermediate level. At the lowest P level, the response of coffee seedlings to AMF inoculation was ineffective, while at the highest level, AMF application was unnecessary for coffee growth.

Keywords : Coffea arabica; Rhizoglomus fasciculatum; mycorrhizal colonization; shoot dry weight; soil testing.

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