Response of Sudan grass [Sorghum sudanense] to various levels of nitrogen in combination with phosphorus under rainfed conditions

abonos fosfatados abonos nitrogenados altura application rates caracteres de rendimiento composante de rendement contenido de materia seca contenido proteico cost benefit analysis crop yield cultivo de temporal culture pluviale dose d'application dry matter content hauteur height leaf area macollamiento nitrogen fertilizers phosphate fertilizers protein content rendement des cultures rendimiento de cultivos sorghum arundinaceum superficie foliar superfosfato superphosphate surface foliaire tallage tillering urea uree yield components