الفهرس 
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Abstract
This investigation aims to figure out the effects of organic and bio-fertilization on growth, yield and nutrients uptake of maize under saline conditions.Two field trials were regulated at El-Serw Agricultural Research Station, Damietta Governorate in summers of 2012&2013 seasons. Split Plot design with three replications were conducted to study the effect of different saline soil levels (the main plots) (low salinity soil 2.31 and 2.00 dSm-1 for the first and second seasons, respectively, medium salinity soil 5.30 and 4.60 dSm-1 for the first and second seasons, respectively. High salinity soil 7.31 and 7.29 dSm-1 for the first and second seasons, respectively), (the sub plots) the organic fertilization (control organic fertilization, 10 ton fed-1 poultry manure, 10 tonfed-1 10 ton fed-1 compost, farmyard manure, 20 ton fed-1 Poultry Manure > 20 ton fed-1 compost >20 ton fed-1 farmyard manure) (the sub subplots) biofertilization (Azotobacter and phosphorin) on growth, yield and nutrients uptake of maize plant under saline conditions.Soil samples of each experiment were taken from depths 0-30 and 30-60 cm, respectively and it were analyzed to investigate some physical and chemical properties.In consideration of soil analysis was determined at the end of each experiment to figure out the electric conductivity (EC), pH values, total organic matter percentage, exchangeable sodium percentage (ESP%) and available nutrients (N, P, K. Actually, high soil salinity levels reduced significantly P% and P-uptake in maize grains and stover. On the contrary, there was a significant over plus in P% and P-uptake in maize grains and stover on the account of applying organic fertilizer. Besides, the application of N-P inoculations had a significant increment on P% in maize grain. On the contrary, the effect of N-P inoculations in P% on stover was a non significant. Although, there was a significant enhancement in P-uptake in maize grains and stover by the means of N-P inoculations. The highest results were obtained with (low soil salinity level + 20 ton fed-1 poultry manure + Azotobacter inoculation) .It is worth mentioning that organic and N-P biofertilizion Applications influenced some soil properties, thereupon the fertility and productivity of the soil was enhanced. Entirely, the electric conductivity was increased in the presence of the organic fertilizer. And it was more effective in increasing OM (%), available N, P, K in the soil, the highest values were obtained in increasing N in the soil by (low salinity + 20 ton fed-1 poultry manure + Azotobacter),while the highest value was obtained in increasing P and K in the soil (Low salinity + 20 ton fed-1 poultry manure + phosphorin). Application organic fertilizers and phosphorin inoculation resulted in a reduction in soil ESP% and pH.Eventually, it could be concluded that applying organic and biofertilizations (Azotobacter and phosphorin) on maize plant under soil saline conditions is very important to obtain permanent productivity in North Delta region.