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A Field experiment was conducted at the Experimental Farm of agricultural Engineering Research Institute, Agricultural Research Center. Ministry of agriculture and Land Reclamation, at Abdel Monem Reyad Village, El Bustan area at Nubaria sector, during the summer season of 1999 and 2000 . The objectives of the study were to test the effect of two methods of applying nitrogen fertilizer (fertigation and broadcasting), two irrigation levels and two irrigation systems surface and subsurface drip on summer squash production in the sandy soils The main results of the study could be summarized as follow:• Applying the nitrogen fertilizers through two irrigation methods (surface and subsurface drip irrigation) was more efficiency than broadcasting fertilizers. • There are a slightly increase in crop growth, fresh yield, and both of water and nitrogen use efficiency in subsurface drip more than in surface drip. • Subsurface drip irrigation has the best water distribution in the soil. • The highest value of fertilizer use efficiency (35.60 kg) yield/kg nitrogen was obtained with treatment I2L2F2.

EFFECT OF FERTILIZATION AND IRRIGATION WATER LEVELS ON SUMMER SQUASH YIELD UNDER DRIP IRRIGATION