Resumo

HERRERA-ORTIZ, Verónica et al. Identification of cultivable bacteria, pathogenic human in semicomposts of agricultural waste. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.6, pp.1189-1201. ISSN 2007-0934.

Organic fertilizers, important sources of organic matter to the soil, containing substantial microorganisms, some potentially pathogenic to humans. In 2009, at the Faculty of Agrotechnological Sciences of the Autonomous University of Chihuahua, the presence of total and faecal coliforms was evaluated, and Salmonella sp., in four 24-week semicomposts decomposition, obtained from mixtures of sawdust (A) and corn-mixture (E) as a carbon source, and bovinaza (B) and manure (G) as nitrogen source. In addition, human pathogenic bacterial genera with the API 20E system were identified. Stablishing a completely randomized design of factorial 2 x 2. Comparison ofmeans was done with the Tukey test (a=0.05). The results showed significant interactions: total coliform, manure-time (p< 0.0038) with difference at week 12, and 24. reduction in faecal coliform, manure-waste plant (p< 0.0477) where the sawdust left 8.18 and 9.19 log NMPg^-1 for poultry and bovinaza, respectively, with a downward trend in both. T3-GE showed better influence on the reduction of faecal coliforms. 17 human pathogenic bacterial genera identified during the process. The products of the treatments had lower diversity and frequency ofpathogens initial mixtures. In the post-treatment products, 12 genera were identified, the most common Pseudomonas aeruginosa and Grimontia hollisae, in three and four of the treatments, respectively. Only T1-GA and T4-BE had lower incidence of risky human pathogens.

Palavras-chave : Salmonella sp.; faecal coliforms; total coliforms; organic fertilizers.

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