Macedo, W. et al. 2014. Response of forage mixtures to liming and different sources of phosphorus in two types of soils in Rio Grande do Sul, Brazil. Pesquisa Agropecuaria Brasileira. 11, 5 (Apr. 2014), 33–40. DOI:https://doi.org/10.1590/S1678-3921.pab1976.v11.16887.