Abstract

RODRIGUEZ MILLAN, Karla Alejandra et al. Contribution of Benefical Microorganisms While Added to the Dried Cabbage (Brassica oleracea var capitata) Residues and its Effect on pH Soil. Rev. mex. fitopatol [online]. 2013, vol.31, n.1, pp.29-44. ISSN 2007-8080.

It is suggested that cabbage dry residues provide antagonist microorganisms to plant pathogens and they modify the pH of the soil. We used cabbage sun-dried residues, packaged and preserved in a dry environment for two and five years. They were analyzed microbiologically, and their effect on the pH of a sterile soil for 30 d, and the type and number of microorganisms they can incorporate were studied. We also determined its effect on pH, the physical, chemical and biological characteristics in five unsterilized soils for 51 d. In the residues, the Bacillus sp., Pseudomonas sp., Trichoderma sp. and Penicillium sp. predominated. In vitro, Bacillus and Pseudomonas showed antibiosis against Rhizoctonia solani and Fusarium oxysporum f sp. lycopersi. Trichoderma and Bacillus were mycoparasites of these fungi respectively. In sterile soil, residues increased the pH from 7.57 to 8.79, and favored the development of bacteria (160x10⁷ ufc g^-1 soil), mainly from Bacillus and Pseudomonas. In four of the non-sterile soils, the pH was always significantly (P <= 0.05) lower than the control and ranged dynamically between 7.33 and 8.24; the content of assimilable nitrogen, potassium, and the bacteria g^-1 in soil were increased; Bacillus and Pseudomonas were incorporated; and the development of Penicillium was promoted.

Keywords : organic soil amendments; antagonistic microorganisms; Bacillus; Pseudomonas; Trichoderma.

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