الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This study spanned two successive seasons of 2008-2009/ 2009-2010 to study the effect of variety, mycorrhizae and phosphate dissolving bacteria on plants of faba bean and wheat crops grown in pots of clay and sand soils. Faba bean varieties included (Giza 40, Giza 429 and Giza 674) while wheat varieties included (Giza 168, Sakha 93 and Benisuif 1). Microorganism treatments included mycorrhiza, phosphate dissolving bacteria and their mixture compared to the control in two successive seasons of pots of clay and sand soils.
The values of all traits studied on both of faba bean and wheat grown in either clay or sand soil were higher in the second season than those of the first season and that may be resulted from the climate changes between the two seasons. Fourteen traits were studied on both faba bean and wheat plants i.e. plant height, plant dry weight, nitrogen % in plants, plant nitrogen uptake, phosphorus % in plants, plant phosphorus uptake, zinc (ppm) in plants, plant zinc uptake, root infection with phosphate dissolving bacteria, microbial dependency %, acid phosphatase activity in plant roots and acid and alkaline phosphatase activity in soil. That results are summarized as follows:
The results derived from faba bean plants grown on clay soil show that plant height of faba bean variety Giza 674 surpassed both the heights of Giza429 and Giza 40, the dry weight of faba bean plants reached its maximum in variety Giza 674 and surpassed the other two faba bean varieties for plant nitrogen content, nitrogen uptake, phosphate content, plant potassium content and potassium uptake, plant zinc content and zinc uptake in its plants, root infection with phosphate dissolving bacteria, microbial dependency percentage of plants, acid phosphatase activity in its roots and acid and alkaline phosphatase activity in the soil.
The best treatment of microorganisms of mycorrhiza and phosphate di5”··~.lving bacteria increased plant heights was the treatment with the mixture of microorganisms compared to the control treatment where it gave the tallest plants, the heaviest dry weight, the highest percentage of plant nitrogen, the highest plant nitrogen uptake, plant phosphorus content, plant phosphorus uptake, plant potassium content and potassium uptake, plant zinc content and zinc uptake in faba bean plants, root infection with phosphate dissolving bacteria, microbial dependency percentage of plant, acid phosphatase activity in its roots of plants and acid and alkaline phosphatase activity in the soiL
There were superiority of faba bean variety Giza 674 treated with the mixture of microorganisms in plant dry weight, plant zinc content and zinc uptake in its plants, root infection with mycorrhiza, microbial dependency percentage of plants.
The heights of faba bean plants grown in pots of sand soil were shorter than in clay and they were affected with single factors of variety, microorganism and season where the height of Giza 429 surpassed both the heights of Giza 40 and Giza 674 plants and faba bean variety Giza 429 was the most durable variety under sand soil conditions that attained the heaviest dry weight, the highest plant nitrogen uptake, plant phosphorus content and plant phosphorus uptake, plant potassium content and plant potassium uptake, plant zinc content and zinc uptake, acid phosphatase activity in roots and acid and alkaline phosphatase activity in soil. Faba bean variety Giza 674 surpassed the other two varieties in their root infection with mycorrhiza in contrary to the other traits.
The mixture inoculum phosphate dissolving bacteria gave the tallest plants with compared to control treated plants, gave the heaviest dry weight of faba bean plants., the highest plant nitrogen content and plant nitrogen uptake, plant phosphate content and plant phosphate uptake, plant potassium content and plant potassium uptake, the heaviest root infection with mycorrhiza, acid
phosphatase activity in faba bean roots and acid and alkaline phosphatase activity in soil.
The interaction between varieties and microorganisms treatments resulted in the superiority of faba bean variety Giza 429 that was treated with the mixture of microorganisms with plant dry weight declaring the importance of the choice of the variety and the treatment for the soil type. The same interaction resulted in attaiping the highest plant potassium content, zinc content and zinc uptake. However, this interaction showed the superiority of faba bean variety Giza 674 treated with the mixture of microorganisms that surpassed all values of faba bean plants in their root infection mycorrhiza.
The height of wheat variety Giza 168 plants and its plant dry weight surpassed the other two wheat varieties and its plants attained the highest values of nitrogen content, plant nitrogen uptake, plant phosphate content, plant phosphate uptake, plant potassium content, plant potassium uptake, plant zinc content, plant zinc uptake, its root infection with mycorrhiza, acid phosphatase activity in its roots and acid and alkaline phosphatase activity in clay soil grown with wheat plants.
The treatment with the mixture of microorganisms gave the heaviest dry weight of plants of compared to control treatment. This treatment also attained the highest value of plant nitrogen content, plant nitrogen uptake, plant phosphorus content, plant phosphorus uptake, plant potassium content, plant potassium uptake, plant zinc content, plant zinc uptake, wheat root infection with mcorrhiza, microbial dependency % in wheat plants, acid phosphatase activity in wheat roots and acid and alkaline phosphatase activity in clay soil grown with wheat plants.
Wheat variety Giza 168 treated with the mixture of microorganisms attained the highest value of plant dry weight, plant phosphate uptake, plant zinc uptake, its root infection with mycorrhiza, microbial dependency % in its plants
The tallest wheat plants were obtained from wheat variety Giza 168 that surpassed the other two wheat varieties. Wheat variety Giza 168 also was the most durable variety under sandy soil conditions that attained the highest plant dry weight, plant nitrogen content, plant nitrogen uptake, plant phosphorus content, plant phosphorus uptake, plant potassium content, plant potassium uptake, plant zinc content, plant zinc uptake, its root infection with mycorrhiza, acid phosphatase activity of its wheat roots and acid and alkaline phosphatase activity of the soil.
The microbial mixture of mycorrhiza and phosphate dissolving bacteria increased the heights of wheat plants compared to the control treatment. The microbial mixture of phosphate dissolving bacteria also attained the highest value of plant dry weight, plant. nitrogen content, plant nitrogen uptake, plant phosphorus content, plant phosphorus uptake, plant potassium content, plant potassium uptake, plant zinc content and plant zinc uptake, wheat root infection with mycorrhiza, microbial dependency % of wheat plants, acid phosphatase activity of wheat roots and acid and alkaline phosphatase activity of the soil.
Wheat variety Giza 168 treated with the mixture of microorganisms attained the heaviest plant dry weight declaring the importance of the choice of the variety and the treatment for the soil type. The same wheat variety treated with the mixture of microorganisms attained the highest value of plant nitrogen content, plant nitrogen uptake, plant phosphorus content, plant phosphorus uptake, plant potassium content, plant potassium uptake, plant zinc content , plant zinc uptake, its root infection with phosphate dissolving bacteria under the same treatment, acid phosphatase activity of its wheat roots and acid and alkaline phosphatase activity of the soil. However, the interaction between variety and microorganism treatment showed the superiority of wheat variety Benisuif 1 treated with the mixture of microorganisms in microbial dependency % that surpassed all other values of wheat plants grown on sand.