Resumo

MONTENEGRO GOMEZ, Sandra Patricia; MENJIVAR FLOREZ, Juan Carlos; BONILLA CORREA, Carmen Rosa  e  MADRINAN MOLINA, Raúl. Influence of the vinasse application on activity and microbial biomass in an Entic dystropept and a Fluventic haplustoll soils of the Cauca Valley, Colombia. Acta Agron. [online]. 2009, vol.58, n.1, pp.41-45. ISSN 0120-2812.

With the vinasse application, a residue from the production of fuel ethanol from sugarcane, the effect on the activity of soil microbial biomass an the supply of K⁺ to crop sweet corn (Zea Mays) in two soils of the Cauca Valley, Colombia were evaluated: Entic Dystropept and Fluventic Haplustoll . Was used a completely randomized design with four replications and five treatments: T1 (100% requirement of K⁺ with KCl), T2 (100% requirement of K⁺ with vinasse), T3 (50% requirement of K⁺ with KCl + 50% with vinasse), T4 (25% requirement of K⁺ with KCl +75% with vinasse). The microbial biomass was estimated by the fumigation-extraction method. The results were evaluated using analysis of variance, mean comparison test and correlation and resgression (SAS). There were significant differences in the activity and microbial biomass-C by sampling time and among deferent samples. At the end of the crop, the Entic Dystropept had higher content of microbial biomass-C at T2, while in the Fluventic Haplustoll showed higher content in T1. The lowest qCO₂ was for the Entic Distropept at T2 and T1 in Fluventic Haplustoll. These treatments had a greater accumulation of biomass in each soil respectively T2 (30 450 kg ha^-1) and T1 (21 015.6 ha kg^-1).

Palavras-chave : Inceptisol; Mollisol; microbial biomass; metabolic quotient; accumulation of biomass.

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