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The current investigation was conducted in two different soil types (sandy and clay loam) at

Two field experiments were carried out on a sandy loam soil at El-Tahrir Province Sector during two successive winter-growing seasons of 2005/2006 and 2006/2007 to study the response of wheat growth, yield and some yield components to inoculation with N2-fixing bacteria under different levels of mineral N-fertilization using sprinkler irrigation system. Wheat seeds (Triticum aestivum L., cv. Sids 1) were inoculated shortly before planting by Azorhizobium caulinodans, Gluconacetobacter diazotrophicus, Bacillus polymyxa as a single treatment or seeds inoculated with mixture of such strains. The tested bacterial strains were interacted with different levels of mineral N fertilizer (zero, 25, 50, 75 and 100 kg N/fed). Nitrogen fertilizer was added in the form of ammonium sulphate (20.5% N). Superphosphate (15.5% P2O5) and potassium sulphate (48% K2O) were added at rates of 200 kg/fed and 100 kg/fed, respectively as a recommended dose. The experimental design was a split plot design with three replications and the plot size was 6 m 2 .Regarding the response to inoculation with N2-fixing bacteria, results of both tested seasons showed that there are significant increases in all wheat vegetative growth, yield and some yield components due to inoculation with any tested diaztotrophs. However, using mixture strains followed by Bacillus polymyxa treatments surpassed other inoculated treatments or uninoculated ones. As general, a comparison between inoculants on all wheat growth aspects as well as wheat yield and its yield components showed the order: Mixture> Bacillus polymyxa> Gluconacetobacter diazotrophicus> Azorhizobium caulinodans> uninoculated treatment.The response of wheat growth, yields and yield components to increasing application rate of mineral N fertilizer was significant. Using higher rates of mineral Nfertilizer (100 kg N/fed) showed higher values of all tested parameters under investigation in both seasons.Taking the interaction between inoculation and different N fertilizer levels into consideration, the best results of wheat growth, yield and its components were achieved when wheat plants inoculated with mixture strains followed by Bacillus polymyxa in combination with 50 kg N/fed, which showed a positive response and gave values nearly similar to or higher than using the full dose of mineral N-fertilizer (100 kg N/fed). This trend was true in both tested seasons.From these results it could be concluded that the inoculation with N2-fixing bacteria, particularly in a mixture form, may be acting as a good practice for enhancing wheat growth aspects and improving the crop yield and yield components. Also, it could compensate 50% of the recommended inorganic-N used in sandy loam soil with no decrease in wheat quantity or quality.

The objective of the research was to improve the properties of grape cuttings to obtain strong and healthy plantlets and overcome the problems they encounter during cultivation in clay and sandy soils to become vigorous and healthy trees without using chemical fertilizer. This experiment investigated how to vermicompost tea and Plant Growth-Promoting Rhizobacteria (PGPR), individually or in mixed form, influenced the characteristics of grape cuttings cultivated in clay and sandy soils. Some physical and chemical parameters for cutting were measured such as parameters of vegetative growth and root, chemical parameters of plant, and soil parameters as CaCo3 % content, and total count bacteria CFU/g. The results proved that the type of soil affected the growth of cuttings. All treatments gave significant differences, compared with the control. Sometimes significant differences were found among treatments on parameters, and sometimes not. In general, the best effect on the growth of the cuttings was in a treatment that included the combination of vermicompost tea and PGPR, whether cultivated in sandy or clay soil, in both successive growing seasons.

Plastic pots sown with seeds of faba bean variety Giza 429 susceptible to chocolate spot disease caused by Botrytis fabae were grown in a screenhouse . Two biofungucides (Bioarc and Biozeid), one green Algae (Ulva) and two chemical fertilizers (Alpha and Oris) were utilized in this research. Data obtained showed that disease severity was higher in the season of 2008/2009 than the season of 2009 / 2010. Bioarc and Biozeid significantly controlled the disease more than the other tested products.Bioarc and Ulva gave the highest increase in fresh weight, while Bioarc and Biozeid were superior in increasing the dry weight. Ulva and Alpha showed the higher plant height and also the number of branches of shoots. In addition, Alpha and Biozeid gave the highest weight of 100 seeds while Ulva and Alpha significantly increased the number of pods / plant. Also , Ulva was the only product increased seed number / pod. Determination of NPK level in faba bean shoot revealed that tested materials increased the level of the three elements to different degrees. Bioarc and Alpha significantly increased the highest level of P while the effect of the other materials was variable. Similar trends were observed in the two seasons of trials.