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Abstract
A field experiment was carried out on mature fruiting Washington navel orange trees growing in Belbis, Sharkia Gov. under flood irrigation system during the two successive seasons of 2004 and 2005. Experimental trees received ten different combinations of mineral nitrogen (MN), organic nitrogen (ON) and biofertilizers (Bio). Control trees received 1kg MN without bio or organic fertilizers. Other combinations were: 1.0, 0.75, 0.50 kg mineral N with or without organic or (Biogein or EM).