Studies on the mixture combination in permanent pasture, 3: Effects of nitrogen fertilization and cutting management on the nutritive value

abonos nitrogenados application rates crude fibre digestibilidad digestibility dose d'application energy value ensemencement fibra bruta fibre brute frecuencia de las cosechas gramineas graminee grasses harvesting frequency mezclado minerales minerals mixing nitrogen fertilizers organic matter pastizal permanente permanent pastures prairie permanente siembra sowing