“…Well managed rangelands of Pampa can reach a dry matter production around 14 Mg ha -1 year -1 (Oliveira et al, 2015); in contrast, in areas with inadequate management, the productions achieve averages between 3.7 Mg ha -1 year -1 (Soares et al, 2005) and 9.8 Mg ha -1 year -1 (Pellegrini et al, 2010). The principal causes of low productivity is high soil acidity (pH ~ 4.4) and low fertility, such as reduced available P (2.6 to 7.6 mg of P kg -1 ), especially in soils of Southern Brazil (Oliveira et al, 2011;Rheinheimer et al, 1997;Tiecher et al, 2014). In the scenario of low fertility, an increase of nutrients availability by limestone and phosphorus fertilizers are important strategies to support plant development (Gatiboni et al, 2000;Prestes et al, 2017Prestes et al, , 2016.…”