Soil microorganisms enhance the plant availability of phosphorus (P). This ability is related to the production of organic acids and the activity of phosphatases. It is assumed that the production of organic acids solubilize insoluble phosphate forms to usable form such as orthophosphate, increasing its potential availability to plants (Vázquez et al. 2000). Filamentous fungi such as Trichoderma sp. have advantages in acid soils presenting morphological and metabolic characteristics that make them promising organisms (Nahas, 1996; Vera et al, 2002). On the other hand, inoculation of soil with phosphate solubilizing fungi has been shown to increase yields in crops like maize and wheat (Singh and Reddy, 2011), beans (Wahid and Mehana, 2000), chickpea (Kapri and Tewari, 2010).