The present work was carried out to determine: Digestibility coeficient of the dry matter; For the purpose an area comprising 600 m² of Latossolo Vermelho Amarelo (Oxisol) at São Carlos, State of São Paulo, Brazil on the farm Canchim, research institute which belongs to EMBRAPA, on which trial was conducted the meadow was cut and fertilized with ammonium sulphate at the rate of 250 kg/ha. At intervals of 30 days after the cutting up to 180 days plants corresponding to one square metre were collected. The coeficient of digestibility of the dry matter was determined in vitro. It was found that the coeficient of digestibility was bight at 30 days with 51.9% and lowers to 29.4% at 180 days.