Response of sorghum variety Gada El Hamam to different rates of nitrogen and phosphorus and their combination ions at Rahad [Sudan]

abonos np cosecha crop yield engrais np graine harrowing harvesting hersage ion iones ions lluvia muestreo nitrogen phosphorus fertilizers plant production pluie rain rastreo rendement des cultures rendimiento de cultivos sampling seeds semilla soil sol sorghum bicolor soudan sudan suelo variedades varieties