الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 82 |  |  |
| | | from | 82 | | |
Abstract
Two pot experiments were conducted to test plant growth and yields of faba bean (Vicia faba cultivar Giza 348) and wheat, Triticum astevum cultivan (Gemiza 11),the soil grown on sandy calcareous soil of EL-Goreib Exptl. Farm : characterized by high content of CaCO3 (17.09%), poor content or organic C (0.12%) and available P; the aim was to improve plant growth and yield obtained, as well as increasing the total uptakes of P and N by the following treatments :-
1. Application of organic compost ( AL-Zahraa Vegetarian Compost) to soil, at rate of 25 g / pot, before planting, as source of organic carbon to improve the physical and chemical characteristic of soil, and stimulate the microbial community in the soil.
2. Inoculation of seeds or grains before planting with specific beneficial microbial strains, that fix atmospheric N2 (symbiolically or non-symbiotic); or improve plant growth and yield through production of hormones or organic acids that improve plant growth, as well as, uptake of elemental nutrients, particularly phosphorus
• The following inoculated microbial species were tested in case of:-
Faba bean
1. Rhizobium leguminosarum (R)
2. Rhizobium+ yeast (Y)
3. Rhizobium+Bacillus polymexiae
4. Rhizobium+yeast+Bacillus
Wheat
1. Azospirillium brasilense (Azo)
2. Azospirillium+yeast (S.cereviciae)
3. Azospirillium + Bacillus polymexiae
4. Azospirillium+yeast+Bacillus
• Black polyethylene bags, each containing 5 Kg of the soil, was supplemented with super phosphate 15.5%P2O5 added at rate of (0.5 g/pot) for all treatments before planting. Eight replicate pots were planted from each treatment of faba bean or wheat.
• All treatment of faba bean was fertilized once with 30 Kg N/ fad. (0.32 g urea/ pot) after 20 days from planting.Whereas all treatments of wheat were fertilized with 60 Kg N/fad. (0.652 g/pot in two doses) after 15 days from planting and the second after 15 days from the first dose.
• Plants in four replicate pots were examined after 50 days from planting for growth measurement and determination of P and N uptakes, while the other four replicates were harvested for yield determination and total uptake of P and N at 110 days from planting.
The statistically analyzed results indicated the following at the vegetative and harvest growth stage:-
4. Compost application significantly increased fresh and dry weights of faba bean and wheat plants, as well as no. of nodules in faba bean.
5. At harvest, compost application resulted in 41.3% increase of seed yield of faba bean,and in 15.3% increase in grain yield of wheat.
6. Microbial inoculation of faba bean seeds with(R+yeast) or (R+Bacillus) resulted in significant increases in seed yield, but had no-significant effects on straw yield. Also, Total N- content and total P-content in faba bean seeds were significantly increased by (R+yeast) or (R+ Bacillus) inoculation treatments.
7. It was also noticed that the faba bean inoculation treatment with (Rh+yeast) resulted in formation of bigger fan shape nodules compared to the round nodules produced on plant roots inoculated with Rhizobium alone.
8. At harvest of faba bean (after 110 days) significant positive interaction was recorded between compost application and the microbial seeds inoculation treatment (R+Y) which resulted in highest recorded straw and seeds yields as well as total N content in straw and total P content in seeds and straw yield.
9. In wheat, the microbial inoculation treatment of wheat grains before planting with (Azospirillium + Bacillus), produced the highest significant increases in grain and straw yields of wheat.