Abstract

HOYOS-CARVAJAL, LILLIANA; CARDONA, ANDRÉS; OSORIO, WALTER  and  ORDUZ, SERGIO. The effect of various isolates of Trichoderma spp. on nutrient uptake in beans (Phaseolus vulgaris) in two soil types. rev.colomb.cienc.hortic. [online]. 2015, vol.9, n.2, pp.268-278. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2015v9i2.4183.

Trichoderma is a genus of fungi widely known for suppressing pathogens and promoting plant growth, enhancing the availability and absorption of nutrients and increasing foliar nutrient concentrations in different plants. With the goal of proving the prospect for agricultural use of Colombian native isolates, seven isolates that were previously selected in in vitro tests were tested to measure their effect on the nutrient levels and growth variables in beans grown under greenhouse conditions. The bean plants were sown in an Andisol and Ultisol, as the substrate, then they were inoculated with different strains of Trichoderma. The time these bean plants needed to reach the various stages of cultivation was assessed. For the flowering, the leaf area, number of nodes and dry matter and foliar concentrations of N, P, K, S, Mg, Ca, Fe, Zn, B, Cu and Mn were measured. In terms of nutrient solubilization in the plants established in Andisols, inoculation with the Trichoderma strains increased the foliar concentrations of Cu, Fe, Ca, Mg and K, with statistically significant differences. With the Ultisoles, the foliar concentrations of P and Cu were higher in the bean plants inoculated with Trichoderma, confirming the positive effect of the fungus on the leaf nutrient concentrations and demonstrating that nutrient solubilization by Trichoderma is a phenomenon influenced by the substrate or agricultural soil.

Keywords : microorganisms; solubilization; growth; Leguminosae.

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