A field experiment were conducted in order to know the response of Puntero grass (Hyparrhenia rufa) to the application of diferent amount of Urea, concentrated superphosphate and muriate of potash, in a sand 108m soil of farm located in Chaparral (Tolima) at 1000 above sea level, 250C annual mean temperature, and 2.500mm annual mean precipitation. Box and Hunter's surface response model was usedas advised by the Instituto Agropecuario Colombiano.The regresion analysis shows that increasing applications levels of Nitrogen (urea) and Phosphorus (superphosphate) increase the amount of green forage and protein conten; highest level of forage 41 ton and protein 3.5% content were obtained using 400 and 200 kg.ha-1 of urea and superphosphate. From this information, the author recomend the use of amounts between 150 and 200 ofurea and 75 and 100 of superphosphate kilogramesper hectar.