Influence of Phosphorous, Nitrogenous Fertilizers and Seeding Rates on Green Forge Yield and Its Quality of Sudangrass (Sorghum vulgare var. Sudanense (Piper) Stapf) under Ismailia Governorate Conditions - Egypt

Two field experiments were conducted in summer seasons of 2010 and 2011 at Agricultural ResearchStation, Faculty of Agriculture; Suez Canal University at Ismailia governorate; Egypt. The soil textures of experimentswere sandy. The experiments are aimed to study the response of Sudangrass cv. Giza "2" to three phosphorus fertilizerrates (0, 37 and 74 kg P2O5/ha), three rates of nitrogen (74, 121 and 171 kg N/ha), and two seeding rates (24 and 36 kgseed/ha). The design of each experiment was split-split plots design. Sowing date was 9th of May in two growingseasons. Plant height, leaves and stem fresh weight/plant, total plant fresh weight, leaf-stem ratio, green forageyield/cut, total green forage yield/season, CP %, and CP yield/cut were increased by increasing phosphorus fertilizerrates up to 74 kgP2O5/ha, and also, it were increased by increasing nitrogen fertilizer rates up to 171 kg N/ha, whilecrude fiber % was increased by increasing phosphorus levels and decreased by increasing nitrogen levels. At all cuts,increase seeding rates up to 36 kg/ha significantly increased plant height, green forage yield/cut and total green forageyield/season, but decreased significantly leaves and stem fresh weight/plant, total plant fresh weight, but didn’t affectsignificantly leaf-stem ratio, CP yield/cut, and CF %..