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Screening of Indigenous Microorganisms as Potential Biofertilisers for Periurban Horticulture Areas

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume and issue assigned later), 1080350
DOI: http://dx.doi.org/10.13044/j.sdewes.d8.0350
Giselle A. Querejeta1, Leticia Rossi1, Andrea M. Monroy1, Laura J. Raiger Iustman2, Diana L. Vullo3
1 Chemistry Area, Institute of Sciences National University of General Sarmiento, J.M. Gutierrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina
2 Biological Chemistry Department, Faculty of Natural Sciences, University of Buenos Aires, IQUIBICEN-CONICET, Ciudad Universitaria, Pab II, Piso 4, 1428, Buenos Aires, Argentina
3 CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina

Abstract

In Buenos Aires periurban area, horticultural practices are one of the most important activities. Pesticides and fertilisers are used without any control to cover the farmers´ needs, obtaining high crop yields at short terms and modifying soil ecosystem in the long term. The aim of this work was to isolate indigenous strains from periurban horticultural units with pesticide degrading capacity and to evaluate their plant growth-promoting properties in order to design biofertilisers to be applied in the restoration of these exploited soils. After the screening, eight strains were isolated and identified. They showed not only the capacity to produce indole-3- acetic acid, to fix nitrogen, to secrete siderophores and to solubilise calcium phosphate but also tolerated the mixture of pesticides usually used for horticultural practices.  By their behaviour in mixed cultures and plant growth-promoting properties, these autochthonous isolates represent a promising alternative as biofertilisers according to soil type and activity.

Keywords: Biofertiliser, Periurban horticulture, Plant growth-promoting rhizobacteria, Pesticide degrading bacteria, Bioinoculant, Microbe-mediated soil restoration.

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