A field experiment was conduced during the summer seasons of 2005 and 2006 at Disuq district, Kafr El-Sheikh Governorate to study the combined effect of inoculation with Halex-2 (as biofertilizer) and mineral nitrogen levels on cowpea yield and their net return.Split plot design was used with four replicates. The main plots were assigned by two treatments of uninoculated (control), and inoculated with Halex-2. Whereas, the sub-plots were assigned by five N levels (0, 10, 20, 30 and 40 kg N fed -1 ). Four polynomial quadratic equations were established to show the following results:1. The maximum and optimum N rates were decreased as Halex-2 used in the two seasons. 2. The maximum and optimum cowpea yields were increased as Halex-2 used in the two seasons. 3. The highest maximum yield (1413.2 kg fed -1 ), the highest total value of yield (7065.0 L.E fed -1 ) and the highest return of bio and N fertilizer (2936.6 LE fed -1 ) were obtained as Halex-2 used in the first season. 4. The average of efficiency and the efficiency of nitrogen fertilizer at optimum rate were increased as Halex-2 used. 5. The soil nitrogen content during plant growth (Xs) was increased as Halex-2 added. 6. The contribution of soil N was increased as Halex-2 used in the two seasons. 7. The contribution of N fertilizer was increased as N levels increased in the two seasons.
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
winter season, to assess response of some wheat (Triticum aestivum L.) varieties to the nitrogen fertilization levels by determining the dry plant weight, daily increase, N% in the dry matter, nitrogen uptake during the growing periods and nitrogen uptake during the physiological stages. Split plot design with four replicates was used, the main plots were assigned by four wheat varieties of Gimiza 9, Sakha 61, Sakha 93 and Giza 168. 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 previous traits. The obtained results can be summarized as follow: Gimiza 9 and Giza 168 had the higher dry plant weight of 6.64 and 6.95 (g/plant) compared to Sakha 61 and Sakha 93 of 5.97 and 5.98 (g/plant). Dry plant weight was increased with increasing nitrogen levels. The highest daily increase of Gimiza 9 was (138 mg/day) at 97-111 days period, Sakha 61 was (97 mg/day) at 69-83 days period, Sakha 93 was (102 mg/day) at 83-97 days period and Giza 168 was (140 mg/day) at 61-69 days periods. Nitrogen % was higher in the first growth period and decreased with time and was increased with increasing the nitrogen levels. Giza 168 had the highest nitrogen uptake (145.27 mg N/plant) there was no significant difference between Gimiza 9, Sakha 61 and Sakha 93. Nitrogen uptake was increased from 71.16 to 129.04, 158.18 and 173.3 (mg N/plant) with increasing the nitrogen levels from 0 to 30, 60 and 90 kg N fed.-1 respectively. Gimiza 9 absorbed 23.57% of total nitrogen uptake at tillering, 46.12% at head development stage and 30.32% at flowering stage. Sakha 61 absorbed 26.06%, 49.19% and 24.76% from total nitrogen uptake at tillering, head development and flowering stages, respectively. Sakha 93 absorbed 23.55%, 42.22% and 34.23% from total nitrogen uptake at tillering, head development and flowering stages, respectively. Giza 168 absorbed 22.54%, 46.34% and 31.12% from total nitrogen uptake at tillering, head development and flowering stages, respectively.
Two field experiments were carried out at Wady Elnatron, El-Behera Governorate, during 2007 and 2008 seasons, to study the effect of irrigation water amounts and nitrogen rates, on cucumber 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 (0 addition (N0), 50 (N1), 100 (N2) and 150 (N3) kg N fed.-1 .) as ammonium nitrate. 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 as irrigation water amounts decreased in the two seasons. 2. The maximum and optimum cucumber yields (Ym and Yopt) were decreased as irrigation water amounts decreased in the two seasons. 3. The highest maximum yield (23.01 ton fed-1), (1 feddan = 0.42 hectar), the highest total value of yield (27605 L.E. fed-1) and the highest return of N fertilizer (13864 L.E. fed-1) were obtained as irrigation water amount 100% of ETc used in the two seasons. 4. The efficiencies of N rates (eX) were decreased as N rates increased from N0 to N1, N2 and N3, respectively, with different irrigation water amounts. 5. The efficiency average (X e), the relative efficiency (EX) and the efficiency of nitrogen fertilizer at optimum rate (eXopt), were decreased as irrigation water amounts decreased. 6. The soil nitrogen content during plant growth (Xs) was increased 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 as N levels increased in the two seasons.
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