Two field experiments were conducted at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, Egypt during the two successive seasons of 2007 and 2008. The objectives of this research were: (i) to study the effect of irrigation scheduling using three different pan evaporation coefficients on maize yield; (ii) to evaluate the growth, yield and N use efficiency of maize as affected by different rates of N fertilization. The treatments were arranged in a split plot design with four replicates. The main plots were assigned with three irrigation regimes I1, I2and I3 irrigated at 1.2 ,1.0 and 0.8 of accumulation of A.P.E. Five nitrogen rates i.e. zero,60, 90,120 and 150 kg N fed.-1 in the sub plots namely N1, N2, N3 , N4 and N5 . Results showed that 1.2 of A.P.E significantly increased grain yield by 5.4, 8.9% and straw yield by 5.7 , 11.3% compared to irrigation at 1.0, 0.8 of A.P.E. respectively. Also irrigation at 1.2 of A.P.E resulted in higher amount of irrigation water applied to be 3150 m 3 /fed distributed on 7 irrigations , followed by irrigation at 1.0 to be 2830 m 3 /fed distributed on 6 irrigations , and irrigation at 0.8 of A.P.E. was 2370 m 3 /fed distributed on 5 ones. The highest consumptive water used was obtained under irrigation with 1.2 pan evaporation coefficient i.e. 2386 m 3 .while the lowest 1998 m 3 obtained from irrigation at 0.8 of A.P.E.. Lower frequent irrigation due to irrigation at 0.8 of A.P.E. resulted in a significantly increased water productivity compared to the other two irrigation treatments it was 1.260, 1.903 and 1.957 kg/m 3 for I1, I2 and I3 respectively Increasing nitrogen rates up to 150 kg N fed.-1 (N5 ) significantly increased grain and straw yield by 69 , 50 ; 11.9 ,22.5 ; 4.7 , 4.7 % as compared to N1 ; N2 ; N3 treatments respectively but not significant with N4 Nitrogen use efficiency (NUE) increased with decreasing water applied .It was 77.47 , 79.25 and 80.07 % for I1 , I2 , I3,respectively , and decreased with increasing N rate; 88.1 ,85.7 , 77.4 and 64.5 for N2 ; N3 ; N4 and N5 respectively. Therefore, to increase water productivity and to save irrigation water, it could be recommended to irrigate maize at 1.0 of A.P.E in middle north Nile Delta soils to save water of about 320 m 3

Two field trials were carried out at Sakha Agric. Res. St. farm during two successive winter seasons of 2007/2008 and 2008/2009, to assess the effect of planting methods and phosphorus fertilization treatments on faba bean yield, nutrient contents and some water relationships. Faba bean (Vicia faba L.) seeds var. Sakha 2 were planted on November in both seasons. Split plot design was used with four replicates. The main plots were assigned by two planting methods i.e. A: 120 cm furrow spacing with 4 planting rows per furrow and B:60 cm furrow spacing with 2 planting rows per furrow. The sub plots were assigned by four phosphorus treatments .e.1-application of 30 kg P2O5 fed-1 (ha = 2.4 fed.) as superphosphate 15.5% P2O5 (P2O5 = 2.29 x P) , 2-completing the soil available phosphorus up to 30 kg P2O5 fed

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Two field experiments were carried out at Wady Elnatron, El-Behera Governorate, "Wady Elnatron located in the west desert near the Delta about 90 kilometers north west of Cairo", during 2008 and 2009 seasons to study the effect of irrigation water amounts and nitrogen rates on maize yield and the net return from these treatments under drip irrigation system. Split plot design was used with four replicates. The main plots were assigned by four irrigation water amounts (100 %, 90 %, 80 % and 70 %) of evapotranspiration (ETc). The sub-plots were randomly assigned by four nitrogen rates (zero, 50, 100 and 150 kg N fed.-1 ) as ammonium nitrate (ha = 2.4 fed.). The other recommended agriculture practices were done. Four polynomial quadratic equations were established to show the following results: 1. The maximum and optimum N rates (Xm and Xopt) were increased by decreasing irrigation water amounts from 100% to 70% of ETc in the two seasons. 2. The maximum and optimum maize yields (Ym and Yopt) were decreased by decreasing irrigation water amounts from 100% to 70% of ETc in the two seasons. 3. The highest maximum yield (4.307 ton fed.-1 ), the highest total value of yield (6394.5 L.E fed.-1 ) and the highest return of N fertilizer (1744.5 LE fed.-1 ) were obtained with 100 % of ETc used in the two seasons. 4. The efficiencies of N rates (eX) were decreased by increasing N rates from N0 to N1, N2 and N3, respectively with different irrigation water amounts. 5. The relative efficiency (EX), the efficiency of nitrogen fertilizer at optimum rate (eXopt) and the efficiency of soil nitrogen (eXs) were decreased as irrigation water amounts decreased. 6. The soil nitrogen content during plant growth (Xs) was decreased as irrigation water amounts decreased. 7. The contribution of soil N was decreased as irrigation water amounts decreased in the two seasons. 8. The contribution of N fertilizer was increased by increasing N levels in the two seasons.

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