Abstract

RAMIREZ GIL, Joaquín Guillermo; OSORNO BEDOYA, Laura; OSORIO VEGA, Nelson Walter  and  MORALES OSORIO, Juan Gonzalo. Microbiological Alternatives for the Improvement of Cowpea Growth. Rev. Fac. Nac. Agron. Medellín [online]. 2013, vol.66, n.2, pp.7035-7044. ISSN 0304-2847.

The low phosphorus (P) availability in soil, absorption inefficiency and high costs of phosphate fertilization are limiting factors for agricultural productivity. A biotechnological alternative is the use of soil microorganisms, capable of improving P disponibility, absorption and the use of fertilizer cheaper as rock phosphate fertilization (PR). This experiment was performed under screen house conditions aiming to evaluate the effect of an arbuscular-mycorrhizal fungus (HMA) (Glomus fasciculatum) and a P solubilizing fungus (MSP) (Mortierella sp.) on P uptake and cowpea (Vigna unguiculata L. Walp.) growth, planted with three concentrations (0, 100 and 300 mg of P per each kg of soil) of PR. A significant increase (P-≤0.05) in dry mass, plant height, mean stem diameter and foliar phosphorus, was observed in the HMA-inoculated plants compared with the HMA-non inoculated plants. No significant differences were identified when PR was added or MSP was inoculated. The results suggest that the use of HMA may improve P absorption and cowpea growth under the evaluated conditions.

Keywords : Glomus fasciculatum; Mortierella sp.; Vigna unguiculata; microorganisms.

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