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A field experiment was conducted at Sakha Agricultural Research Station farm, Kafr El-Sheikh Governorate, Egypt during 2008/2009 winter season to assess the effect of nitrogen fertilization levels on P absorption by some wheat (Triticum aestivum L.) varieties. Split plot design with four replicates was applied, the main plots were assigned by four wheat varieties, Gimiza 9, Sakha 61, Sakha 93 and Giza168. The subplots were assigned by four nitrogen levels of 0, 30, 60 and 90 kg N fed. -1 (ha = 2.4 fed.). Eight plant samples were collected during the growth periods to determine the daily increase of dry plant weight, N%, and P% in dry matter, P uptake during the growing periods and P/N ratio during the physiological stages. The obtained results can be summarized as follow:  Wheat plant absorbed phosphorus nutrient rabidly than nitrogen in the first stage (0-30) days.  P% concentration was approximately higher 3.3 folds in the first stage than the second stage and 4.8 folds than the final stage.  There are a positive relationship between phosphorus absorption and temperature degrees,  The mean values of P% concentration of the used varieties arranged according to the following order : Giza 168 > Sakha 93 > Sakha 61 > Gimia 9.  Phosphorus percentage increased highly significant by increasing nitrogen levels up to 90 kg N/ fed.  P uptake increased highly significant to reach its maximum at fifth stage (61-69) days from sawing (middle of plant age).  The mean values of P uptake of the used varieties arranged in the following order: Giza 168 > Sakha 61 > Gimiza 9 > Sakha 93  The mean values of P uptake increased from0.036 mg/plant/day to 0.053, 0.061 and 0.065 mg/plant/day as nitrogen levels increased from N0, to N30, N60 and N90 respectively.  The highest mean value of P/N ratio (0.067) was obtained at the first stage (0-30).  Increasing nitrogen fertilizer levels from N0 to N30, N60 and N90 led to decrease P/N ratio, from 0.056 to .044, 0.041 and 0.040, respectively.  Increasing wheat yield was associated with decreasing P/N ratio.

EFFECT OF NITROGEN FERTILIZATION LVELS ON POTASSIUM ABSORPTION BY SOME WHEAT VARIETIES IN NORTHERN DELTA REGION