Resumo

ARIZA RODRIGUEZ, Sebastián; GONZALEZ MURILLO, Octavio  e  LOPEZ SANCHEZ, Jacqueline. Evaluation of free nitrogen biological fixers on the growth of grasses on degraded soil. Rev. colomb. biotecnol [online]. 2020, vol.22, n.1, pp.87-97. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v22n1.78019.

Due to the problems of soil degradation that currently occur, the free nitrogen biological fixers (FNBF), have potential as regenerating microorganisms of this resource. With the objective of evaluating its capacity as a functional group, isolation was sought in selective media Ashby and FBN; after its morphological and biochemical characterization; two types of seeds were inoculated, Zea mays and Brachiaria decumbens; planted in degraded soil (La Ortega property of the Universidad de Medellín). Four treatments were performed with 5 repetitions, during 36 days in the greenhouse. The most outstanding results are those described by Brachiaria decumbens by increasing the dry weight and the length of its roots thanks to a FNBF isolate (AshAssm4); which suggests its potential use to improve revegetalization processes.

Palavras-chave : Soil quality; Nitrogen fixation; Plant Growth.

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