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Two field experiments were conducted in summer seasons of 2010 and 2011 at Agricultural Research Station, Faculty of Agriculture; Suez Canal University at Ismailia governorate; Egypt. The soil textures of experiments were sandy. The experiments are aimed to study the response of Sudangrass cv. Giza "2" to three phosphorus fertilizer rates (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 kg seed/ha). The design of each experiment was split-split plots design. Sowing date was 9th of May in two growing seasons. Plant height, leaves and stem fresh weight/plant, total plant fresh weight, leaf-stem ratio, green forage yield/cut, total green forage yield/season, CP %, and CP yield/cut were increased by increasing phosphorus fertilizer rates up to 74 kgP2O5/ha, and also, it were increased by increasing nitrogen fertilizer rates up to 171 kg N/ha, while crude 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 forage yield/season, but decreased significantly leaves and stem fresh weight/plant, total plant fresh weight, but didn’t affect significantly leaf-stem ratio, CP yield/cut, and CF %..

journal of plant production sciences /journal of plant production sciences

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